docs: Make quickstart docs consistent and add Web UI to colab

[adchia]

Signed-off-by: Danny Chiao danny@tecton.ai

What this PR does / why we need it:

Which issue(s) this PR fixes:

Fixes #

[codecov-commenter]

Codecov Report

Merging #2794 (b5d3aa4) into master (6fec431) will decrease coverage by 20.78%.
The diff coverage is n/a.

@@             Coverage Diff             @@
##           master    #2794       +/-   ##
===========================================
- Coverage   80.49%   59.70%   -20.79%     
===========================================
  Files         173      173               
  Lines       15254    15254               
===========================================
- Hits        12278     9107     -3171     
- Misses       2976     6147     +3171     

Flag	Coverage Δ
integrationtests	?
unittests	59.70% <ø> (ø)

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

Impacted Files	Coverage Δ
.../integration/online_store/test_online_retrieval.py	16.84% <0.00%> (-83.16%)	⬇️
sdk/python/tests/utils/online_read_write_test.py	19.35% <0.00%> (-80.65%)	⬇️
...fline_store/test_universal_historical_retrieval.py	23.80% <0.00%> (-76.20%)	⬇️
...ion/registration/test_stream_feature_view_apply.py	23.52% <0.00%> (-74.51%)	⬇️
.../integration/online_store/test_universal_online.py	17.43% <0.00%> (-73.03%)	⬇️
...ests/integration/e2e/test_python_feature_server.py	28.35% <0.00%> (-71.65%)	⬇️
...dk/python/tests/integration/e2e/test_validation.py	27.77% <0.00%> (-71.43%)	⬇️
sdk/python/feast/wait.py	23.52% <0.00%> (-70.59%)	⬇️
...gration/registration/test_feature_service_apply.py	31.25% <0.00%> (-68.75%)	⬇️
...s/integration/registration/test_universal_types.py	32.25% <0.00%> (-67.75%)	⬇️
... and 72 more

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[achals]

/lgtm

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