Rolling and Manual deployments corrections

[vitolkachova]

What's changed

All the points are IMHO, please feel free to reject.

Manual Deployments

• available on all env types, no need to mention that, the obsolete section removed
• removed --help section of CLI command, I think it's obvious enough
• mention that redeploy does not apply staged changes

ZDD

• rework "How to use ZDD" the CLI part, add the code push
• fixed the MDN refernce for retry logic
• add missing section in zdd flow with the original app update
• add info section, that after a failed deployment only stopstart can be used
• wording here and there (misused deploy hook)

Where are changes

Updates are for:

• platform (sites/platform templates)
• upsun (sites/upsun templates)