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All of these pages are severely outdated, and if updated would not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Remove outdated paragraph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
Merge pull request #313 from melissalinkert/sprint4-bug-fixes

Sprint 4 bug fixes
Merge pull request #322 from sbesson/extlinks

Extlinks review
Fix Matlab arguments and add description to the ant target
Remove Java objects to prevent warnings in TestCheckJavaPath()

Without these code lines, javaaddpath() & javarmpath() keep on complaining
about existing loci.formats.ChannelSeparator objects even if the readers have
been closed.
Add Matlab and artifacts directories to the path in test-matlab target
Add tools target as dependency of test-matlab