build: rebrand output artifacts to Oak and fix macOS QML deployment

- Rename macOS bundle output from Olive.app to Oak.app.
- Rename editor binary to oak-editor and render worker to oak-render-worker.
- Rename crash handler output to oak-crashhandler.
- Update worker lookup, NSIS installer, Linux desktop/AppRun, crashhandler
  symbol paths, and documentation for the new binary names.
- Update CD workflow paths and add -qmldir flags to macdeployqt so QtQuick
  / QML plugins required by KDDockWidgets are bundled, fixing the launch
  crash on macOS.
- Update user-facing GitHub URLs to OakVideoEditorCommunity/oak.

CONTRIBUTING.md

@@ -2,12 +2,6 @@
 
 Thank you for your interest in contributing to Olive!
 
-## Reporting issues
-
-Bug reports help to make the software more stable and usable.
-Please read the pinned [issue #1175](https://github.com/olive-editor/olive/issues/1175)
-for guidelines before you create a new issue.
-
 ## Writing code
 
 Code contributions are welcome. Note that the code base is rapidly changing in