Added meta info to quickstart[Issue #48]

[muddi900]

Describe your changes

Added a html-meta to quick-start.md. Looking for comments before I modify other docs.

Issue ticket number and link

48

Checklist before requesting a review

• [x] I have performed a self-review of my code
• [ ] I have added thorough tests (when necessary).
• [ ] I have added the right documentation in the docstring and changelog (when needed)

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:books: Documentation preview :books:: https://ploomber-engine--51.org.readthedocs.build/en/51/

[muddi900]

I'll probably add meta info to all docs(*.md and *.rst) as per the issue request. I'll rebase/squash commits before the final push.

[edublancas]

great! please request my review when done