Improve UI and navigation
There are two things in the site that could potentially improve the experience considerably: * Add a sidebar to the index page (https://docs.postmarketos.org/) so that the left side does not look so empty * On all the other pages, replace the announcement top-bar ![image](/uploads/692d7c029585ab5ee5d46b5688470e50/image.png) with some UX similar to what mkdocs or docusaurus do: * Top bar with the different projects if there is enough space: ![image](/uploads/34f521db65701784bc0146d24d51b236/image.png) * Hamburger menu and nested sidebar on mobile/narrow screens: ![image](/uploads/b0ae14bff0ebab3dab0c5e213909f4e4/image.png) ![image](/uploads/0f4f13cf2b4c3d6e83a607a993a2fb8a/image.png) Anybody able to play with Sphinx and modify our theme or index pages to do these two things would be a superhero!
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