chore: Update docs for docker-compose installation

[hughhhh]

SUMMARY

Updating docs to inform users they can use docker compose up to get superset running in development mode. It's kinda of confusing with the initial docs seems like you can only use it using another yaml.

BEFORE/AFTER SCREENSHOTS OR ANIMATED GIF

TESTING INSTRUCTIONS

ADDITIONAL INFORMATION

• Has associated issue:
• Required feature flags:
• Changes UI
• Includes DB Migration (follow approval process in SIP-59)
  • Migration is atomic, supports rollback & is backwards-compatible
  • Confirm DB migration upgrade and downgrade tested
  • Runtime estimates and downtime expectations provided
• Introduces new feature or API
• Removes existing feature or API

[codecov]

Codecov Report

Merging #24980 (ee33748) into master (be11556) will increase coverage by 0.00%.
Report is 2 commits behind head on master.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master   #24980   +/-   ##
=======================================
  Coverage   68.81%   68.81%           
=======================================
  Files        1907     1907           
  Lines       74439    74439           
  Branches     8211     8211           
=======================================
+ Hits        51224    51227    +3     
+ Misses      21083    21080    -3     
  Partials     2132     2132           

Flag	Coverage Δ
hive	53.83% <ø> (ø)
javascript	55.89% <ø> (+<0.01%)	⬆️
mysql	78.57% <ø> (ø)
postgres	78.67% <ø> (ø)
presto	53.73% <ø> (ø)
python	82.81% <ø> (ø)
sqlite	77.26% <ø> (ø)
unit	54.84% <ø> (ø)

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see 1 file with indirect coverage changes

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