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-zap.svg

@@ -1 +1 @@
-<svg viewBox="0 0 10 16" class="svg octicon-zap" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M10 7H6l3-7-9 9h4l-3 7 9-9z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-zap" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M10.561 1.5a.016.016 0 00-.01.004L3.286 8.571A.25.25 0 003.462 9H6.75a.75.75 0 01.694 1.034l-1.713 4.188 6.982-6.793A.25.25 0 0012.538 7H9.25a.75.75 0 01-.683-1.06l2.008-4.418.003-.006a.02.02 0 00-.004-.009.02.02 0 00-.006-.006L10.56 1.5zM9.504.43a1.516 1.516 0 012.437 1.713L10.415 5.5h2.123c1.57 0 2.346 1.909 1.22 3.004l-7.34 7.142a1.25 1.25 0 01-.871.354h-.302a1.25 1.25 0 01-1.157-1.723L5.633 10.5H3.462c-1.57 0-2.346-1.909-1.22-3.004L9.503.429z"/></svg>