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-bold.svg

@@ -1 +1 @@
-<svg viewBox="0 0 10 16" class="svg octicon-bold" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M1 2h3.83c2.48 0 4.3.75 4.3 2.95 0 1.14-.63 2.23-1.67 2.61v.06c1.33.3 2.3 1.23 2.3 2.86 0 2.39-1.97 3.52-4.61 3.52H1V2zm3.66 4.95c1.67 0 2.38-.66 2.38-1.69 0-1.17-.78-1.61-2.34-1.61H3.13v3.3h1.53zm.27 5.39c1.77 0 2.75-.64 2.75-1.98 0-1.27-.95-1.81-2.75-1.81h-1.8v3.8h1.8v-.01z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-bold" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M4 2a1 1 0 00-1 1v10a1 1 0 001 1h5.5a3.5 3.5 0 001.852-6.47A3.5 3.5 0 008.5 2H4zm4.5 5a1.5 1.5 0 100-3H5v3h3.5zM5 9v3h4.5a1.5 1.5 0 000-3H5z"/></svg>