Fix minor documentation quirks in templates/overview

Fix #613

Add maxdeviant.com to examples

adding back default in rebuild

Fix #620

use nix-shell to build on nixos

Fix #616. Add brief documentation for how to use it.

fix minor typo in doc template

Handle csv parsing error when encountering rows with different lengths

Closes #607

Revert "Update snap installation instructions"

This reverts commit 5fd7bf7e61.

Apparently it is not just no longer necessary to use classic
confinement, but actually impossible, i.e. snap emits an error that the
zola snap is not compatible with `--classic`.

Fix format mistake

Fix #604

Only happens for sections with lang != default

Replace trim_{left, right} with trim_{start, end}

trim_{start, end} is introduced in rust 1.30.0 and
trim_{left, right} is deprecated since 1.33.0.

Fix --watch-only to actually rebuild the site

doc: add a Github Action to deploy to Github Pages

Add my blog website to examples file

Footnote is now supported in headers

Add "Hello, Rust!" website to examples file

Make the theme template files render if they are present