doc: README.md - improve "Tshooting" and "Tips & Tricks"

doc: README.md - improve "Tshooting" and "Tips & Tricks"

Improve the formatting and English language in the sections
"Troubleshooting" and "Tips and Tricks", and move those sections to a
place where they don't interrupt the flow of the vstart cluster
installation instructions. Some of the strings in "Tips and Tricks" are
not yet unambiguous sentences that will make sense to the uninitiated,
but this PR represents a step in that direction.

This PR is part of a series of PRs meant to preserve the integrity of
the README.md file after some recent additions that break the flow of
the document.

This PR follows https://github.com/ceph/ceph/pull/61226 and
https://github.com/ceph/ceph/pull/61221.

Signed-off-by: Zac Dover <zac.dover@proton.me>