chore(examples): cleanup folder

[leohhhn]

Description

This PR archives away some example packages that might not be too good of an "example" (ie they are old packages that are partially finished, were used for early GnoVM testing, etc), and updates the README.

Contributors' checklist...

• Added new tests, or not needed, or not feasible
• Provided an example (e.g. screenshot) to aid review or the PR is self-explanatory
• Updated the official documentation or not needed
• No breaking changes were made, or a BREAKING CHANGE: xxx message was included in the description
• Added references to related issues and PRs
• Provided any useful hints for running manual tests

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 63.37%. Comparing base (b849b5a) to head (da7927a).
Report is 1 commits behind head on master.

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #3027      +/-   ##
==========================================
- Coverage   63.38%   63.37%   -0.02%     
==========================================
  Files         566      566              
  Lines       79490    79489       -1     
==========================================
- Hits        50388    50377      -11     
- Misses      25710    25721      +11     
+ Partials     3392     3391       -1     

Flag	Coverage Δ
contribs/gnodev	60.57% <ø> (+0.62%)	⬆️
contribs/gnofaucet	15.77% <ø> (+0.94%)	⬆️
gno.land	67.37% <ø> (ø)
misc/genstd	79.72% <ø> (ø)
tm2	62.42% <ø> (+0.04%)	⬆️

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