[WIP] Move tutorials docs to flyte

[neverett]

Why are the changes needed?

Move markdown versions of tutorials docs to flyte and use rli directive to include code from tutorials Python files in flytesnacks.

What changes were proposed in this pull request?

TK

TODO: update docs contribution guide.

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Related PRs

TK - there will be a related flytesnacks PR.

Docs link

TK

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 61.94%. Comparing base (8eb7b0d) to head (2f973a8).
Report is 9 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5290       +/-   ##
===========================================
- Coverage   76.78%   61.94%   -14.84%     
===========================================
  Files          18      151      +133     
  Lines        1516    10134     +8618     
===========================================
+ Hits         1164     6278     +5114     
- Misses        288     3262     +2974     
- Partials       64      594      +530     

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