Docs/pre 2 adjusts

[jlnav]

• New theme: furo
• Remove pyyaml and tomli mentions
• Adjust many examples and tutorials to use gest-api generators
• Remove some zero-resource-workers mentions
• Moving some descriptions of the alloc_f, W array, work dict, Resources, and History implementation into Additional Resources
• Dramatic rewriting of Ensemble.ready()
• Remove Summit docs
• Clarify in SUPPORT.rst that issues can be opened on github
• remove sim_gen_alloc_api - it doesn't provide new/better info compared to other pages
• WIP

[jlnav]

https://libensemble--1716.org.readthedocs.build/en/1716/index.html

[codecov]

Codecov Report

❌ Patch coverage is 94.91525% with 3 lines in your changes missing coverage. Please review.
✅ Project coverage is 77.81%. Comparing base (f98b666) to head (a088dc9).
⚠️ Report is 122 commits behind head on develop.

Files with missing lines	Patch %	Lines
libensemble/ensemble.py	93.75%	1 Missing and 1 partial ⚠️
libensemble/executors/executor.py	94.44%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff             @@
##           develop    #1716      +/-   ##
===========================================
+ Coverage    77.78%   77.81%   +0.02%     
===========================================
  Files           79       79              
  Lines         8189     8191       +2     
  Branches      1263     1264       +1     
===========================================
+ Hits          6370     6374       +4     
+ Misses        1579     1578       -1     
+ Partials       240      239       -1     

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