Add a "Getting Started" guide to the website
One of the collaboration sessions at [this year's Reproducible Builds Summit in Hamburg](https://reproducible-builds.org/events/hamburg2024/) was an effort to help new developers to make and keep their software reproducible from day zero. The RB website includes a lot of useful reference documentation, however it currently lacks a quickstart/getting-started guide. This issue tracks creation of such a guide. The notes gathered during the summit can be found below (nb: initially riseup pad links; these should be collected on the website itself soon) * Day1: https://pad.riseup.net/p/rbsummmit2024-d1a-gettingstarted-keep * Day2: https://pad.riseup.net/p/rbsummmit2024-d2m-gettingstarted-keep * Day3: https://pad.riseup.net/p/rbsummmit2024-d3m-gettingstarted-keep
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