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-rss.svg

@@ -1 +1 @@
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+<svg viewBox="0 0 16 16" class="svg octicon-rss" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M2.002 2.725a.75.75 0 01.797-.699C8.79 2.42 13.58 7.21 13.974 13.201a.75.75 0 11-1.497.098 10.502 10.502 0 00-9.776-9.776.75.75 0 01-.7-.798zM2 13a1 1 0 112 0 1 1 0 01-2 0zm.84-5.95a.75.75 0 00-.179 1.489c2.509.3 4.5 2.291 4.8 4.8a.75.75 0 101.49-.178A7.003 7.003 0 002.838 7.05z"/></svg>