Initial clean up and text corrections.
Further markup changes to achieve consistency.
Add instructions about node deployment.
Merge pull request #677 from sbesson/homebrew_5.0.0

Document Homebrew formula upgrade to 5.0.0
Fix list indentation.
Suggested mailing list note update
Updated section on search re-indexing (see #11995)
merge dev_5_0 -D org -I include -E exclude: PR 678 (Update OMERO.grid doc)
merge dev_5_0 -D org -I include -E exclude: PR 679 (Suggested mailing list note update)
merge dev_5_0 -D org -I include -E exclude: PR 680 (Updated section on search re-indexing (see #11995))