[DOCS] reorganizes content under the 1.0 Set up a GX environment topic

[Rachel-Reverie]

Description

• Creates the "Set up a GX environment" category and landing page.
• Splits "Install Python" and "Install GX" into individual topics

Definition of done

• PR title is prefixed with one of: [BUGFIX], [FEATURE], [DOCS], [MAINTENANCE], [CONTRIB]
• Appropriate tests and docs have been updated

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 77.83%. Comparing base (27eb8d2) to head (038d6a1).

Additional details and impacted files

@@           Coverage Diff            @@
##           develop    #9930   +/-   ##
========================================
  Coverage    77.83%   77.83%           
========================================
  Files          456      456           
  Lines        39606    39606           
========================================
  Hits         30827    30827           
  Misses        8779     8779           

Flag	Coverage Δ
3.10	64.39% <ø> (-0.02%)	⬇️
3.10 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.10 aws_deps	?
3.10 big	?
3.10 databricks	?
3.10 filesystem	?
3.10 mssql	?
3.10 mysql	?
3.10 postgresql	?
3.10 snowflake	?
3.10 spark	?
3.10 trino	?
3.11	64.40% <ø> (ø)
3.11 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.64% <ø> (ø)
3.11 aws_deps	44.84% <ø> (ø)
3.11 big	53.87% <ø> (ø)
3.11 databricks	46.12% <ø> (ø)
3.11 filesystem	59.35% <ø> (ø)
3.11 mssql	49.10% <ø> (ø)
3.11 mysql	49.16% <ø> (ø)
3.11 postgresql	53.28% <ø> (ø)
3.11 snowflake	46.79% <ø> (ø)
3.11 spark	56.54% <ø> (ø)
3.11 trino	51.20% <ø> (ø)
3.8	64.43% <ø> (ø)
3.8 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	53.65% <ø> (ø)
3.8 aws_deps	44.85% <ø> (ø)
3.8 big	53.88% <ø> (ø)
3.8 databricks	46.13% <ø> (ø)
3.8 filesystem	59.36% <ø> (ø)
3.8 mssql	49.08% <ø> (ø)
3.8 mysql	49.14% <ø> (ø)
3.8 postgresql	53.27% <ø> (ø)
3.8 snowflake	46.80% <ø> (-0.01%)	⬇️
3.8 spark	56.50% <ø> (ø)
3.8 trino	51.18% <ø> (ø)
3.9	64.42% <ø> (ø)
3.9 athena or clickhouse or openpyxl or pyarrow or project or sqlite or aws_creds	?
3.9 aws_deps	?
3.9 big	?
3.9 databricks	?
3.9 filesystem	?
3.9 mssql	?
3.9 mysql	?
3.9 postgresql	?
3.9 snowflake	?
3.9 spark	?
3.9 trino	?
cloud	0.00% <ø> (ø)
docs-basic	47.52% <ø> (ø)
docs-creds-needed	48.63% <ø> (ø)
docs-spark	47.37% <ø> (ø)

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[kwcanuck]

A quick review as requested. Feel free to implement or ignore the edits.