Add link to IDAES+ webpages in docs

[dangunter]

Fixes

Summary/Motivation:

Changes proposed in this PR:

Legal Acknowledgement

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 73.81%. Comparing base (91b6f1b) to head (0c3702d).
⚠️ Report is 2 commits behind head on main.

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #1735   +/-   ##
=======================================
  Coverage   73.81%   73.81%           
=======================================
  Files         399      399           
  Lines       65373    65373           
  Branches    11007    11007           
=======================================
  Hits        48257    48257           
  Misses      14605    14605           
  Partials     2511     2511           

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