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-circle-slash.svg

@@ -1 +1 @@
-<svg viewBox="0 0 14 16" class="svg octicon-circle-slash" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M7 1C3.14 1 0 4.14 0 8s3.14 7 7 7 7-3.14 7-7-3.14-7-7-7zm0 1.3c1.3 0 2.5.44 3.47 1.17l-8 8A5.755 5.755 0 011.3 8c0-3.14 2.56-5.7 5.7-5.7zm0 11.41c-1.3 0-2.5-.44-3.47-1.17l8-8c.73.97 1.17 2.17 1.17 3.47 0 3.14-2.56 5.7-5.7 5.7z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-circle-slash" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1.5 8a6.5 6.5 0 0110.535-5.096l-9.131 9.131A6.472 6.472 0 011.5 8zm2.465 5.096a6.5 6.5 0 009.131-9.131l-9.131 9.131zM8 0a8 8 0 100 16A8 8 0 008 0z"/></svg>