docs: example of adding Marketing links via the plugin slots

[PKulkoRaccoonGang]

Description

This PR includes updated slots description for adding Marketing links and logoDestination props for Header component.

Note

The logoDestination prop was added to the display of the correct link in the header for MFE Catalog pages.
Relative PR: raccoongang/frontend-app-catalog#10

How Has This Been Tested?

1. Clone and mount this repository.
2. Add env.config.js and example adding Marketing links via plugin slots in MFE.
3. Check adding links in the MFE header.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 68.82%. Comparing base (f740d01) to head (162772b).

Additional details and impacted files

@@            Coverage Diff             @@
##           master     #598      +/-   ##
==========================================
+ Coverage   68.75%   68.82%   +0.07%     
==========================================
  Files          48       48              
  Lines         432      433       +1     
  Branches       97       98       +1     
==========================================
+ Hits          297      298       +1     
  Misses        132      132              
  Partials        3        3              

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