Update JS dependencies (#15033)

* Update JS dependencies

- Update all JS dependencies
- For octicons, rename trashcan to trash
- For svgo, migrate to v2 api, output seems to have slightly changed but icons look the same
- For stylelint, update config, fix custom property duplicates
- For monaco, drop legacy Edge support
- For eslint, enable new rules, fix new issues
- For less-loader, remove deprecated import syntax

* update svgo usage in generate-images and rebuild logo.svg with it

public/img/svg/gitea-git.svg

@@ -1 +1 @@
-<svg viewBox="0 0 48 48" class="svg gitea-git" width="16" height="16" aria-hidden="true"><path fill="#F4511E" d="M42.2 22.1L25.9 5.8c-.5-.5-1.2-.8-1.9-.8s-1.4.3-1.9.8l-3.5 3.5 4.1 4.1c.4-.2.8-.3 1.3-.3 1.7 0 3 1.3 3 3 0 .5-.1.9-.3 1.3l4 4c.4-.2.8-.3 1.3-.3 1.7 0 3 1.3 3 3s-1.3 3-3 3-3-1.3-3-3c0-.5.1-.9.3-1.3l-4-4c-.1 0-.2.1-.3.1v10.4c1.2.4 2 1.5 2 2.8 0 1.7-1.3 3-3 3s-3-1.3-3-3c0-1.3.8-2.4 2-2.8V18.8c-1.2-.4-2-1.5-2-2.8 0-.5.1-.9.3-1.3l-4.1-4.1L5.8 22.1c-.5.5-.8 1.2-.8 1.9s.3 1.4.8 1.9l16.3 16.3c.5.5 1.2.8 1.9.8s1.4-.3 1.9-.8l16.3-16.3c.5-.5.8-1.2.8-1.9s-.3-1.4-.8-1.9z"/></svg>
+<svg viewBox="0 0 48 48" class="svg gitea-git" width="16" height="16" aria-hidden="true"><path fill="#F4511E" d="M42.2 22.1 25.9 5.8c-.5-.5-1.2-.8-1.9-.8s-1.4.3-1.9.8l-3.5 3.5 4.1 4.1c.4-.2.8-.3 1.3-.3 1.7 0 3 1.3 3 3 0 .5-.1.9-.3 1.3l4 4c.4-.2.8-.3 1.3-.3 1.7 0 3 1.3 3 3s-1.3 3-3 3-3-1.3-3-3c0-.5.1-.9.3-1.3l-4-4c-.1 0-.2.1-.3.1v10.4c1.2.4 2 1.5 2 2.8 0 1.7-1.3 3-3 3s-3-1.3-3-3c0-1.3.8-2.4 2-2.8V18.8c-1.2-.4-2-1.5-2-2.8 0-.5.1-.9.3-1.3l-4.1-4.1L5.8 22.1c-.5.5-.8 1.2-.8 1.9s.3 1.4.8 1.9l16.3 16.3c.5.5 1.2.8 1.9.8s1.4-.3 1.9-.8l16.3-16.3c.5-.5.8-1.2.8-1.9s-.3-1.4-.8-1.9z"/></svg>