Migrate Pipeline User Guide

[droumis]

This revises the Pipeline user guide content into several how-tos within the Advanced section

• Create a Pipeline
• Create a Non-Linear Pipeline
• Customize Pipeline Layout
• Control Pipeline Flow

[codecov]

Codecov Report

Merging #4422 (dc7d160) into main (077b86e) will decrease coverage by 0.02%.
The diff coverage is n/a.

❗ Current head dc7d160 differs from pull request most recent head 345a609. Consider uploading reports for the commit 345a609 to get more accurate results

@@            Coverage Diff             @@
##             main    #4422      +/-   ##
==========================================
- Coverage   81.80%   81.78%   -0.02%     
==========================================
  Files         238      238              
  Lines       34872    34872              
==========================================
- Hits        28526    28520       -6     
- Misses       6346     6352       +6     

Flag	Coverage Δ
ui-tests	35.95% <ø> (ø)
unitexamples-tests	73.55% <ø> (-0.03%)	⬇️

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

Impacted Files	Coverage Δ
panel/io/document.py	53.57% <0.00%> (-0.60%)	⬇️
panel/io/state.py	63.02% <0.00%> (-0.53%)	⬇️
panel/config.py	59.34% <0.00%> (-0.51%)	⬇️
panel/tests/util.py	90.09% <0.00%> (ø)

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[philippjfr]

Awesome! If you could you remove the user guide I'll merge.

[droumis]

done