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-diff-added.svg

@@ -1 +1 @@
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+<svg viewBox="0 0 16 16" class="svg octicon-diff-added" width="16" height="16" aria-hidden="true"><path fill-rule="evenodd" d="M13.25 2.5H2.75a.25.25 0 00-.25.25v10.5c0 .138.112.25.25.25h10.5a.25.25 0 00.25-.25V2.75a.25.25 0 00-.25-.25zM2.75 1h10.5c.966 0 1.75.784 1.75 1.75v10.5A1.75 1.75 0 0113.25 15H2.75A1.75 1.75 0 011 13.25V2.75C1 1.784 1.784 1 2.75 1zM8 4a.75.75 0 01.75.75v2.5h2.5a.75.75 0 010 1.5h-2.5v2.5a.75.75 0 01-1.5 0v-2.5h-2.5a.75.75 0 010-1.5h2.5v-2.5A.75.75 0 018 4z"/></svg>