docs: consolidate wiki into the ReadTheDocs documentation
Migrate the substantive wiki pages (installation, troubleshooting,
tutorials, developer tutorials, dataset specs, physics overviews,
analysis tools, python interface) to galacticus.readthedocs.io and
replace each with a short pointer to its new ReadTheDocs page. Delete 10
empty 'Coming soon' stub pages. Rewrite the Home landing page and add a
ReadTheDocs banner to the sidebar. Repoint the remaining retired-PDF
manual links (in the kept Constraints pages) to ReadTheDocs.
Kept on the wiki: the Constraints calibration pages (figure-heavy),
Reference-Library, Galacticus-Metrics, and Contributing/Coding-Conventions.
Co-Authored-By: Claude Opus 4.8 (1M context) <noreply@anthropic.com>
fix: Update HDF5 intro URL
fix: Update HDF5 tools links
Update parameter names now that "Method" suffix is no longer used (see https://github.com/galacticusorg/galacticus/issues/14).
Updated Tutorial: Power Spectra (markdown)
Created Tutorial: Power Spectra (markdown)