Update Octicons to v10 (#12240)

* Update Octicons to v10

Besides a few renames, these icons are no longer present in v10 that we've
used, so had to change:

file-symlink-directory -> file-submodule
internal-repo -> repo
repo-force-push -> repo-push
repo-template-private -> repo-template

Fixes: https://github.com/go-gitea/gitea/issues/11889
Ref: https://github.com/primer/octicons/releases/tag/v10.0.0

* add custom sliders svg for removed octicon-settings

* apply suggestion

* fix triangles and use play on admin dashboard

* add custom mirror svg

* add missing build files

* unify custom svgs

* move to octicon-repo-clone to gitea-mirror

* use octicon-x on conflicts

* tweak timeline icons

* tweak comment buttons

* update settings icon to octicons v1

* switch to octicon-mirror and octicon-tools

* replace two wiki buttons with octicons

* remove whitespace in svg sources

* Fix filepath basename on Windows for SVG bindata (#12241)

* move octicons to devDependencies

* move back to dependencies

* move svgo to devDependencies again

Co-authored-by: Cirno the Strongest <1447794+CirnoT@users.noreply.github.com>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

public/img/svg/octicon-ruby.svg

@@ -1 +1 @@
-<svg viewBox="0 0 16 16" class="svg octicon-ruby" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M13 6l-5 5V4h3l2 2zm3 0l-8 8-8-8 4-4h8l4 4zm-8 6.5L14.5 6l-3-3h-7l-3 3L8 12.5z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-ruby" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M3.637 2.291A.75.75 0 014.23 2h7.54a.75.75 0 01.593.291l3.48 4.5a.75.75 0 01-.072.999l-7.25 7a.75.75 0 01-1.042 0l-7.25-7a.75.75 0 01-.072-.999l3.48-4.5zM4.598 3.5L1.754 7.177 8 13.207l6.246-6.03L11.402 3.5H4.598z"/></svg>