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-chevron-left.svg

@@ -1 +1 @@
-<svg viewBox="0 0 8 16" class="svg octicon-chevron-left" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M5.5 3L7 4.5 3.25 8 7 11.5 5.5 13l-5-5 5-5z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-chevron-left" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M9.78 12.78a.75.75 0 01-1.06 0L4.47 8.53a.75.75 0 010-1.06l4.25-4.25a.75.75 0 011.06 1.06L6.06 8l3.72 3.72a.75.75 0 010 1.06z"/></svg>