DOC-533 Remove outdated duplicate notification config content

[neverett]

What changes were proposed in this pull request?

Remove outdated duplicate content and link to deployment docs notification config page.

Check all the applicable boxes

• I updated the documentation accordingly.
• All new and existing tests passed.
• All commits are signed-off.

Docs link

TK

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 36.17%. Comparing base (d797f08) to head (cb59e71).
Report is 149 commits behind head on master.

Additional details and impacted files

@@             Coverage Diff             @@
##           master    #5672       +/-   ##
===========================================
+ Coverage    9.74%   36.17%   +26.42%     
===========================================
  Files         214     1302     +1088     
  Lines       39190   109492    +70302     
===========================================
+ Hits         3820    39608    +35788     
- Misses      35031    65746    +30715     
- Partials      339     4138     +3799     

Flag	Coverage Δ
unittests-datacatalog	51.37% <ø> (ø)
unittests-flyteadmin	55.33% <ø> (?)
unittests-flytecopilot	12.17% <ø> (ø)
unittests-flytectl	62.32% <ø> (?)
unittests-flyteidl	7.08% <ø> (ø)
unittests-flyteplugins	53.31% <ø> (?)
unittests-flytepropeller	41.74% <ø> (?)
unittests-flytestdlib	55.33% <ø> (?)

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