[OpenMP][docs] Revise building manual (#176175) Go into more detail on the two non-legacy build modes. I decided use create a dedicated document documention the build process. `index.rst` only keeps the "Getting Started" part. `README.rst` is vastly outdated with the still valid parts integrated into the new documentation. `SupportAndFAQ.rst` is unstructured and keeps only the non-building parts. The the new building document is written in Meltdown, following the decision from LLVM.
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