Remove ChatGPT support, document code, small refactor

This commit performs the following backwards-incompatible
modifications to the codebase:

- ChatGPT support is completely removed. Since this was particularly
  fragile, undocumented, and an unsupported use case (both from our
  part and from OpenAI's part), it is better removed until/if
  ChatGPT provides an API.

- The code is documented with GoDoc-compliant comments.

- The NewClient function no longer receives an input struct, but only
  receives the OpenAI API key.

- The `Ask` method no longer accepts a `readmePath` argument, as
  this only worked with ChatGPT. Documentation also makes it clear
  that this method is meant to be used in CLI programs only.

- The `askViaAPI` method is renamed `GenerateCode` and thus
  publically exposed, allowing real library usage of the module.

Due to these breaking changes, this commit should be released as part
of version 2.0.0 of aiac:

    git tag v2.0.0
    git push origin v2.0.0
    go mod tidy
    go mod publish

README.md

@@ -9,8 +9,16 @@ Generator.
 <!-- vim-markdown-toc GFM -->
 
 * [Description](#description)
-* [Use Cases](#use-cases-and-example-prompts)
+* [Use Cases and Example Prompts](#use-cases-and-example-prompts)
+ * [Generate IaC](#generate-iac)
+ * [Generate Configuration Files](#generate-configuration-files)
+ * [Generate CICD Pipelines](#generate-cicd-pipelines)
+ * [Generate Policy as Code](#generate-policy-as-code)
+ * [Generate Utilities](#generate-utilities)
+ * [Command Line Builder](#command-line-builder)
+ * [Query Builder](#query-builder)
 * [Quick Start](#quick-start)
+ * [Instructions](#instructions)
 * [Example Output](#example-output)
 * [Support Channels](#support-channels)
 * [License](#license)
@@ -28,36 +36,41 @@ output.
 ## Use Cases and Example Prompts
 
 ### Generate IaC
+
 - `aiac get terraform for a highly available eks`
 - `aiac get pulumi golang for an s3 with sns notification`
 - `aiac get cloudformation for a neptundb`
 
 ### Generate Configuration Files
+
 - `aiac get dockerfile for a secured nginx`
 - `aiac get k8s manifest for a mongodb deployment`
 
 ### Generate CICD Pipelines
+
 - `aiac get jenkins pipeline for building nodejs`
 - `aiac get github action that plans and applies terraform and sends a slack notification`
 
 ### Generate Policy as Code
+
 - `aiac get opa policy that enforces readiness probe at k8s deployments`
 
 ### Generate Utilities
+
 - `aiac get python code that scans all open ports in my network`
 - `aiac get bash script that kills all active terminal sessions`
 
 ### Command Line Builder
+
 - `aiac get kubectl that gets ExternalIPs of all nodes`
 - `aiac get awscli that lists instances with public IP address and Name`
 
 ### Query Builder
+
 - `aiac get mongo query that aggregates all documents by created date`
 - `aiac get elastic query that applies a condition on a value greater than some value in aggregation`
 - `aiac get sql query that counts the appearances of each row in one table in another table based on an id column`
 
-
-
 ## Quick Start
 
 First, install `aiac`:
@@ -68,34 +81,39 @@ Or using `docker`:
 
  docker pull ghcr.io/gofireflyio/aiac
 
+Or using `go install`:
+
+ go install github.com/gofireflyio/aiac/v2
+
 Alternatively, clone the repository and build from source:
 
  git clone https://github.com/gofireflyio/aiac.git
  go build
 
-
 ### Instructions
 
 1. Create your OpenAI API key [here](https://beta.openai.com/account/api-keys).
 1. Click “Create new secret key” and copy it.
 1. Provide the API key via the `OPENAI_API_KEY` environment variable or via the `--api-key` command line flag.
 
-By default, aiac prints the extracted code to standard output and asks if it should save or re-generate the code 
+By default, aiac prints the extracted code to standard output and asks if it
+should save or regenerate the code:
 
  aiac get terraform for AWS EC2
 
 To store the resulting code to a file:
 
  aiac -o aws_ec2.tf get terraform for AWS EC2
-  
-To run using `docker`
+
+To run using `docker`:
 
  docker run \
  -it \
  -e OPENAI_API_KEY=[PUT YOUR KEY HERE] \
  ghcr.io/gofireflyio/aiac get terraform for ec2
 
 ## Example Output
+
 Command line prompt:
 
  aiac get dockerfile for nodejs with comments

go.mod

@@ -1,19 +1,17 @@
-module github.com/gofireflyio/aiac
+module github.com/gofireflyio/aiac/v2
 
 go 1.19
 
 require (
- github.com/adrg/xdg v0.4.0
  github.com/alecthomas/kong v0.7.1
  github.com/briandowns/spinner v1.19.0
- github.com/google/uuid v1.1.2
+ github.com/fatih/color v1.7.0
  github.com/ido50/requests v1.5.0
  github.com/manifoldco/promptui v0.9.0
 )
 
 require (
  github.com/chzyer/readline v0.0.0-20180603132655-2972be24d48e // indirect
- github.com/fatih/color v1.7.0 // indirect
  github.com/mattn/go-colorable v0.1.2 // indirect
  github.com/mattn/go-isatty v0.0.16 // indirect
  go.uber.org/atomic v1.10.0 // indirect

go.sum

@@ -38,8 +38,6 @@ cloud.google.com/go/storage v1.14.0/go.mod h1:GrKmX003DSIwi9o29oFT7YDnHYwZoctc3f
 dmitri.shuralyov.com/gpu/mtl v0.0.0-20190408044501-666a987793e9/go.mod h1:H6x//7gZCb22OMCxBHrMx7a5I7Hp++hsVxbQ4BYO7hU=
 github.com/BurntSushi/toml v0.3.1/go.mod h1:xHWCNGjB5oqiDr8zfno3MHue2Ht5sIBksp03qcyfWMU=
 github.com/BurntSushi/xgb v0.0.0-20160522181843-27f122750802/go.mod h1:IVnqGOEym/WlBOVXweHU+Q+/VP0lqqI8lqeDx9IjBqo=
-github.com/adrg/xdg v0.4.0 h1:RzRqFcjH4nE5C6oTAxhBtoE2IRyjBSa62SCbyPidvls=
-github.com/adrg/xdg v0.4.0/go.mod h1:N6ag73EX4wyxeaoeHctc1mas01KZgsj5tYiAIwqJE/E=
 github.com/alecthomas/assert/v2 v2.1.0 h1:tbredtNcQnoSd3QBhQWI7QZ3XHOVkw1Moklp2ojoH/0=
 github.com/alecthomas/kong v0.7.1 h1:azoTh0IOfwlAX3qN9sHWTxACE2oV8Bg2gAwBsMwDQY4=
 github.com/alecthomas/kong v0.7.1/go.mod h1:n1iCIO2xS46oE8ZfYCNDqdR0b0wZNrXAIAqro/2132U=
@@ -122,7 +120,6 @@ github.com/google/pprof v0.0.0-20201023163331-3e6fc7fc9c4c/go.mod h1:kpwsk12EmLe
 github.com/google/pprof v0.0.0-20201203190320-1bf35d6f28c2/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/pprof v0.0.0-20201218002935-b9804c9f04c2/go.mod h1:kpwsk12EmLew5upagYY7GY0pfYCcupk39gWOCRROcvE=
 github.com/google/renameio v0.1.0/go.mod h1:KWCgfxg9yswjAJkECMjeO8J8rahYeXnNhOm40UhjYkI=
-github.com/google/uuid v1.1.2 h1:EVhdT+1Kseyi1/pUmXKaFxYsDNy9RQYkMWRH68J/W7Y=
 github.com/google/uuid v1.1.2/go.mod h1:TIyPZe4MgqvfeYDBFedMoGGpEw/LqOeaOT+nhxU+yHo=
 github.com/googleapis/gax-go/v2 v2.0.4/go.mod h1:0Wqv26UfaUD9n4G6kQubkQ+KchISgw+vpHVxEJEs9eg=
 github.com/googleapis/gax-go/v2 v2.0.5/go.mod h1:DWXyrwAJ9X0FpwwEdw+IPEYBICEFu5mhpdKc/us6bOk=
@@ -316,7 +313,6 @@ golang.org/x/sys v0.0.0-20210119212857-b64e53b001e4/go.mod h1:h1NjWce9XRLGQEsW7w
 golang.org/x/sys v0.0.0-20210225134936-a50acf3fe073/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210423185535-09eb48e85fd7/go.mod h1:h1NjWce9XRLGQEsW7wpKNCjG9DtNlClVuFLEZdDNbEs=
 golang.org/x/sys v0.0.0-20210615035016-665e8c7367d1/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
-golang.org/x/sys v0.0.0-20211025201205-69cdffdb9359/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab h1:2QkjZIsXupsJbJIdSjjUOgWK3aEtzyuh2mPt3l/CkeU=
 golang.org/x/sys v0.0.0-20220811171246-fbc7d0a398ab/go.mod h1:oPkhp1MJrh7nUepCBck5+mAzfO9JrbApNNgaTdGDITg=
 golang.org/x/term v0.0.0-20201126162022-7de9c90e9dd1/go.mod h1:bj7SfCRtBDWHUb9snDiAeCFNEtKQo2Wmx5Cou7ajbmo=