Adding notes and examples for config drive support, using --config-file, proxy charms order of operations, charm naming convention, juju deletion issue, juju charms monitoring

Minor review comments on the onboarding document

See merge request !3

Signed-off-by: Carolina Fernandez <carolina.fernandez@i2cat.net>

Merge branch '2-follow-up-from-format-review-unifying-nfvi-requirements-including-epa' into 'master'

Resolve "Follow-up from "Format review": Unifying NFVI requirements including EPA?"

Closes #2

See merge request !2

Merge branch 'master' into '2-follow-up-from-format-review-unifying-nfvi-requirements-including-epa'

# Conflicts:
#   01-requirements.md

- Unified both sections
- Changed numbered list to subsections

Format review

See merge request !1