docs: add toc to all md files

CONFIGURATION.md

@@ -4,6 +4,16 @@
 
 </div>
 
+# Table of contents
+   1. [Creating Your Own Configuration File](#creating-your-own-configuration-file)
+   2. [Writing Your Own Configuration](#writing-your-own-configuration)
+      1. [Constants](#constants)
+         1. [`L_colors`](#`l_colors`)
+      2. [Functions](#functions)
+         1. [`L_compare_entries()`](#`l_compare_entries()`)
+         2. [`L_long_format()`](#`l_long_format()`)
+      3. [Using Defaults](#using-defaults)
+
 Laser is highly customizable through Lua scripts. The default configuration
 file is located at `/usr/local/share/lsr/lsr.lua`. This file is loaded by the
 program and sets the default behavior for laser. You can modify this file or

CONTRIBUTING.md

@@ -7,16 +7,22 @@ See the [Table of Contents](#table-of-contents) for different ways to help and
 details about how this project handles them. Please make sure to read the 
 relevant section before making your contribution.
 
-## Table of Contents
-
-- [I Have a Question](#i-have-a-question)
-- [I Want To Contribute](#i-want-to-contribute)
-- [Reporting Bugs](#reporting-bugs)
-- [Suggesting Enhancements](#suggesting-enhancements)
-- [Your First Code Contribution](#your-first-code-contribution)
-- [Improving The Documentation](#improving-the-documentation)
-- [Styleguides](#styleguides)
-- [Commit Messages](#commit-messages)
+## Table of contents
+1. [I Have a Question](#i-have-a-question)
+2. [I Want To Contribute](#i-want-to-contribute)
+  1. [Reporting Bugs](#reporting-bugs)
+     1. [Before Submitting a Bug Report](#before-submitting-a-bug-report)
+  2. [Suggesting Enhancements](#suggesting-enhancements)
+     1. [Before Submitting an
+        Enhancement](#before-submitting-an-enhancement)
+     2. [How Do I Submit a Good Enhancement
+        Suggestion?](#how-do-i-submit-a-good-enhancement-suggestion?)
+  3. [Your First Code Contribution](#your-first-code-contribution)
+     1. [Development Environment Setup](#development-environment-setup)
+     2. [Code formatting](#code-formatting)
+  4. [Improving The Documentation](#improving-the-documentation)
+3. [Styleguides](#styleguides)
+  1. [Commit Messages](#commit-messages)
 
 ## I Have a Question
 

README.md

@@ -8,6 +8,16 @@
 
 </div>
 
+## Table of contents
+   1. [Installation](#installation)
+      1. [From Homebrew](#from-homebrew)
+      2. [Building from source](#building-from-source)
+   2. [Usage](#usage)
+      1. [Configure](#configure)
+      2. [Command-line options](#command-line-options)
+1. [Contributing](#contributing)
+2. [Authors](#authors)
+
 **lsr** basically `ls` but with colorization and sorting for better readability.
 It offers filtering options, making it easy to
 locate specific files and folders (with grep you'll find exactly what you need)