Replace user guide links

[droumis]

This is in progress, there are many more to fix. :(

[droumis]

@philippjfr, for updates to accessing/manipulating the url (how_to/state/url), I put the port number after the domain .org. Is that incorrect? Before, the page has it after the file path .html

update: Discussed this with @hoxbro - port number after the domain .org is always correct; so the page seems just to have had a typo.

[codecov]

Codecov Report

Merging #4875 (4465756) into main (eee3879) will not change coverage.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##             main    #4875   +/-   ##
=======================================
  Coverage   83.39%   83.39%           
=======================================
  Files         270      270           
  Lines       38122    38122           
=======================================
  Hits        31791    31791           
  Misses       6331     6331           

Flag	Coverage Δ
ui-tests	40.87% <0.00%> (ø)
unitexamples-tests	73.34% <100.00%> (ø)

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

Impacted Files	Coverage Δ
panel/depends.py	74.73% <ø> (ø)
panel/layout/spacer.py	79.31% <ø> (ø)
panel/tests/models/test_location.py	100.00% <100.00%> (ø)

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[philippjfr]

Note I made a lot of fixes here: #4872

[philippjfr]

Thanks!