Merge pull request #681 from sbesson/rebased/develop/homebrew_5.0.0

Document Homebrew formula upgrade to 5.0.0 (rebased onto develop)
Initial clean up and text corrections.
Further markup changes to achieve consistency.
Add instructions about node deployment.
Fix list indentation.
Adjust text layout (avoid blockquotes).
Add terminology and explain requirements.
Clarify deployment commands.
Implement dpwrussell's suggestions.
merge develop -D org: PR 626 (Add new Squash tutorial and screenshots)
merge develop -D org: PR 690 (Update OMERO.grid doc (rebased onto develop))