Available easyconfig parameters for WRF easyblock

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This page will soon replace https://docs.easybuild.io/en/latest/eb_a_e_EB_WRF.html.

** It still needs to be ported from reStructuredText (.rst) to MarkDown (.md),
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• source: docs/eb_a_e_EB_WRF.rst in easybuilders/easybuild repo
• target: docs/version-specific/eb-a-wrf.md in easybuilders/easybuild-docs repo

See https://github.com/easybuilders/easybuild-docs for more information.