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-italic.svg

@@ -1 +1 @@
-<svg viewBox="0 0 6 16" class="svg octicon-italic" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M2.81 5h1.98L3 14H1l1.81-9zm.36-2.7c0-.7.58-1.3 1.33-1.3.56 0 1.13.38 1.13 1.03 0 .75-.59 1.3-1.33 1.3-.58 0-1.13-.38-1.13-1.03z"/></svg>
+<svg viewBox="0 0 16 16" class="svg octicon-italic" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M6 2.75A.75.75 0 016.75 2h6.5a.75.75 0 010 1.5h-2.505l-3.858 9H9.25a.75.75 0 010 1.5h-6.5a.75.75 0 010-1.5h2.505l3.858-9H6.75A.75.75 0 016 2.75z"/></svg>