[frontend] remove duplicate header (#6401)

[frapuks]

Proposed changes

Entities / Events / Knowledge :

• Remove duplicate header

Techniques / Courses of action / select one / select one relationship :

• Remove duplicate header
• Remove padding right
• Focus Overview tab

Related issues

• Duplicate header #6401

Checklist

• I consider the submitted work as finished
• I tested the code for its functionality
• I wrote test cases for the relevant uses case
• I added/update the relevant documentation (either on github or on notion)
• Where necessary I refactored code to improve the overall quality

Further comments

• Please challenge the choice of focus Overview tab
• Demo :
  

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 67.31%. Comparing base (0330878) to head (a905598).

Additional details and impacted files

@@            Coverage Diff             @@
##           master    #6414      +/-   ##
==========================================
- Coverage   67.31%   67.31%   -0.01%     
==========================================
  Files         541      541              
  Lines       65192    65192              
  Branches     5416     5416              
==========================================
- Hits        43884    43883       -1     
- Misses      21308    21309       +1     

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