Map <C-Enter> for vim and make it always submit for submit_on_enter - #226

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/cache@v3, actions/checkout@v3, giraffate/clippy-action@v1, mozilla-actions/sccache-action@v0.0.9. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/