[site] PMD: Update documentation how to compile after modularization
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After PMD has been modularized with 5.2.0, the documentation should reflect this:
http://pmd.github.io/pmd-5.4.0/customizing/compiling.html
Also the readme files in the source code should be adjusted:
https://github.com/pmd/pmd/blob/master/README.md should have a short section, how to compile.
https://github.com/pmd/pmd/blob/master/pmd-core/ReadMe.txt can probably be deleted.
Will be fixed with PMD 5.3.6 and later.
Commit: https://github.com/pmd/pmd/commit/c9dca8dc9231c7e88013210892eb266b1302e983