Fix language filter on load

Fixes #74

Remove unused JS code

js: Remove unused function

Fix TOC rendering issues

While rendering TOC, some items were lost. For example:

- if last h1 has some children or grand children
- if any h1 has multiple h2 (without any h3)

Signed-off-by: Khosrow Moossavi <khos2ow@gmail.com>

Update theme.toml

Bump y18n from 4.0.0 to 4.0.1

Bumps [y18n](https://github.com/yargs/y18n) from 4.0.0 to 4.0.1.
- [Release notes](https://github.com/yargs/y18n/releases)
- [Changelog](https://github.com/yargs/y18n/blob/master/CHANGELOG.md)
- [Commits](https://github.com/yargs/y18n/commits)

Signed-off-by: dependabot[bot] <support@github.com>

Pin the jQuery to the 3.41 tag

netlify: Update to Hugo 0.62.1

Fix Netlify setup

Fix icons