docs: port the how-to/quickstart chapter from discourse

[medubelko]

• Have you followed the guidelines for contributing?
• Have you signed the CLA?
• Have you successfully run tox run -m lint?
• Have you successfully run tox run -e test-py310? (supported versions: py39, py310, py311, py312)

---

For CRAFT-3578

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 89.70%. Comparing base (654871d) to head (50b1446).
Report is 658 commits behind head on main.

❗ There is a different number of reports uploaded between BASE (654871d) and HEAD (50b1446). Click for more details.

HEAD has 1 upload less than BASE

Flag	BASE (654871d)	HEAD (50b1446)
	2	1

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #5176      +/-   ##
==========================================
- Coverage   94.88%   89.70%   -5.18%     
==========================================
  Files         658      341     -317     
  Lines       55189    22587   -32602     
==========================================
- Hits        52364    20262   -32102     
+ Misses       2825     2325     -500     

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[mr-cal]

Looks great, many of my comments are opinions - feel free to ignore them if they are out of scope.

[mr-cal]

LGTM

[lengau]

LGTM as this is fine as is, but I left some improvement suggestions.

[mr-cal]

Spread failure unrelated, it was a network problem when downloading a container.