docs: Docs on structuring repos and scaling feast

[achals]

Signed-off-by: Achal Shah achals@gmail.com

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

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[felixwang9817]

looks good overall!

[codecov-commenter]

Codecov Report

Merging #3122 (a7340de) into master (1f5b1e0) will increase coverage by 8.90%.
The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #3122      +/-   ##
==========================================
+ Coverage   67.13%   76.03%   +8.90%     
==========================================
  Files         177      214      +37     
  Lines       15894    17899    +2005     
==========================================
+ Hits        10670    13610    +2940     
+ Misses       5224     4289     -935     

Flag	Coverage Δ
integrationtests	66.96% <ø> (-0.17%)	⬇️
unittests	57.87% <ø> (?)

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
...on/feast/infra/materialization/snowflake_engine.py	92.70% <0.00%> (-0.53%)	⬇️
.../online_stores/contrib/hbase_online_store/hbase.py	37.25% <0.00%> (ø)
...offline_stores/contrib/mssql_repo_configuration.py	100.00% <0.00%> (ø)
...ffline_stores/contrib/spark_offline_store/spark.py	33.15% <0.00%> (ø)
...ib/trino_offline_store/test_config/manual_tests.py	33.33% <0.00%> (ø)
...ores/contrib/mssql_offline_store/tests/__init__.py	100.00% <0.00%> (ø)
...ontrib/postgres_offline_store/tests/data_source.py	51.02% <0.00%> (ø)
...thon/feast/infra/online_stores/contrib/postgres.py	32.69% <0.00%> (ø)
...ffline_stores/contrib/athena_repo_configuration.py	50.00% <0.00%> (ø)
...ffline_stores/contrib/trino_offline_store/trino.py	8.78% <0.00%> (ø)
... and 100 more

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[felixwang9817]

/lgtm