Remove obsolete format notes

All of these pages are severely outdated, and if updated would not
contain any information that is not already present in source code
comments and the existing format pages.

See #9835.
Final updates to the reader implementation guide

Closes #4534.
Recommend Homebrew instead of MacPorts

See #9835 and
https://github.com/openmicroscopy/bioformats/pull/243#commitcomment-2219859
Remove outdated paragraph
Add Javadoc links to the reader guide
Put metadata support documentation into Sphinx

The summary table still needs a little work.

See #9835.
Fix formatting of format pages
Use 'fiji.sc' instead of 'pacific.mpi-cbg.de'
Fix library table column widths
Fix javadoc links
Add more source and javadoc links
Fix line lengths
Fix various metadata support page issues

Also, include the metadata support pages in the TOC.
Update screenshots to show new download page
Use :formats_plone: instead of :plone:
Fix Sphinx warnings
Fix various minor formatting issues
Reference the list of fields in each of the metadata support pages
Remove the source link to components/legacy

...since this no longer exists on develop.
Merge pull request #333 from melissalinkert/dev-docs-develop

Documentation updates (develop)