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-repo-push.svg

@@ -1 +1 @@
-<svg viewBox="0 0 12 16" class="svg octicon-repo-push" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 3H3V2h1v1zM3 5h1V4H3v1zm4 0L4 9h2v7h2V9h2L7 5zm4-5H1C.45 0 0 .45 0 1v12c0 .55.45 1 1 1h4v-1H1v-2h4v-1H2V1h9.02L11 10H9v1h2v2H9v1h2c.55 0 1-.45 1-1V1c0-.55-.45-1-1-1z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-repo-push" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1 2.5A2.5 2.5 0 013.5 0h8.75a.75.75 0 01.75.75v3.5a.75.75 0 01-1.5 0V1.5h-8a1 1 0 00-1 1v6.708A2.492 2.492 0 013.5 9h3.25a.75.75 0 010 1.5H3.5a1 1 0 100 2h5.75a.75.75 0 010 1.5H3.5A2.5 2.5 0 011 11.5v-9zm13.23 7.79a.75.75 0 001.06-1.06l-2.505-2.505a.75.75 0 00-1.06 0L9.22 9.229a.75.75 0 001.06 1.061l1.225-1.224v6.184a.75.75 0 001.5 0V9.066l1.224 1.224z"/></svg>