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-file-submodule.svg

@@ -1 +1 @@
-<svg viewBox="0 0 14 16" class="svg octicon-file-submodule" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M10 7H4v7h9c.55 0 1-.45 1-1V8h-4V7zM9 9H5V8h4v1zm4-5H7V3c0-.66-.31-1-1-1H1c-.55 0-1 .45-1 1v10c0 .55.45 1 1 1h2V7c0-.55.45-1 1-1h6c.55 0 1 .45 1 1h3V5c0-.55-.45-1-1-1zM6 4H1V3h5v1z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-file-submodule" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M0 2.75C0 1.784.784 1 1.75 1H5c.55 0 1.07.26 1.4.7l.9 1.2a.25.25 0 00.2.1h6.75c.966 0 1.75.784 1.75 1.75v8.5A1.75 1.75 0 0114.25 15H1.75A1.75 1.75 0 010 13.25V2.75zm9.42 9.36l2.883-2.677a.25.25 0 000-.366L9.42 6.39a.25.25 0 00-.42.183V8.5H4.75a.75.75 0 100 1.5H9v1.927c0 .218.26.331.42.183z"/></svg>