Fix CSS for delete in file table (mtlynch#149)

The logic for finding the row was flimsy and we accidentally broke it in c1ce1b3.

URL-encode expiration timestamp (mtlynch#144)

Otherwise, + character gets converted to a space when the server parses it, which causes expiration time parsing to fail.

Fixes mtlynch#139

Fix ESLint errors (mtlynch#129)

* Fix ESLint errors

* Fix CircleCI config

Fix SQLite database path for non-Litestream scenarios (mtlynch#101)

Fixes a bug in docker-entrypoint where we weren't passing the correct -db flag to picoshare unless we were running with Litestream enabled.

Use a constant-time string comparison for password checking (mtlynch#98)

This makes password checking resistant to timing attacks.

Fix link to full-size demo GIF in README (mtlynch#95)

* Fix link to full-size demo GIF in README

* Link to full-size GIF

Add support for drag 'n drop uploading (mtlynch#42)

* work in progress

* Removing console output

* Adjust CSS to hint that drag and drop works

Show progress spinner during upload (mtlynch#43)

Let user specify the file expiration time (mtlynch#37)

Update landing page copy (mtlynch#34)