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-reply.svg

@@ -1 +1 @@
-<svg viewBox="0 0 14 16" class="svg octicon-reply" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6 3.5c3.92.44 8 3.125 8 10-2.312-5.062-4.75-6-8-6V11L.5 5.5 6 0v3.5z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-reply" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6.78 1.97a.75.75 0 010 1.06L3.81 6h6.44A4.75 4.75 0 0115 10.75v2.5a.75.75 0 01-1.5 0v-2.5a3.25 3.25 0 00-3.25-3.25H3.81l2.97 2.97a.75.75 0 11-1.06 1.06L1.47 7.28a.75.75 0 010-1.06l4.25-4.25a.75.75 0 011.06 0z"/></svg>