Edit documentation build instructions

[greschd]

• Distinguish more clearly between doc builds using "default" launch configuration, and docker compose based builds.
• Expand the instructions for environment variables needed when using Docker Compose.
• Don't set the ANSYS_DPF_ACCEPT_LA environment variable in create_doc_windows.ps1, since the user is meant to set this manually.
• Switch to using the latest tag for the DPF Composites container in the documentation build.
• Remove the outdated link to the "launching ACP" section.

Closes #743

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 94.98%. Comparing base (a78a5ab) to head (7670bb7).
Report is 1 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #784   +/-   ##
=======================================
  Coverage   94.98%   94.98%           
=======================================
  Files         109      109           
  Lines        5700     5700           
  Branches      323      323           
=======================================
  Hits         5414     5414           
  Misses        285      285           
  Partials        1        1           

Flag	Coverage Δ
direct-launch	91.57% <ø> (ø)
minimum-deps	93.14% <ø> (ø)
python-3.10	94.21% <ø> (ø)
python-3.11	94.14% <ø> (ø)
python-3.12	94.33% <ø> (ø)
server-2024R2	90.77% <ø> (ø)
server-2025R1	94.14% <ø> (ø)
server-2025R2	94.14% <ø> (ø)
server-latest	94.78% <ø> (ø)

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