[backend/frontend] add policies page

[savacano28]

Proposed changes

• PR docs policies: [docs] Add doc policies docs#22

Related issues

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

If this is a relatively large or complex change, kick off the discussion by explaining why you chose the solution you did and what alternatives you considered, etc...

[codecov]

Codecov Report

Attention: Patch coverage is 9.41176% with 154 lines in your changes missing coverage. Please review.

Project coverage is 26.18%. Comparing base (dce8408) to head (1567e1f).

Files	Patch %	Lines
...va/io/openbas/service/PlatformSettingsService.java	9.03%	141 Missing ⚠️
.../io/openbas/rest/settings/PlatformSettingsApi.java	22.22%	7 Missing ⚠️
...ava/io/openbas/rest/settings/form/PolicyInput.java	0.00%	5 Missing ⚠️
...enbas/rest/settings/response/PlatformSettings.java	0.00%	1 Missing ⚠️

Additional details and impacted files

@@             Coverage Diff              @@
##             master    #1015      +/-   ##
============================================
+ Coverage     25.77%   26.18%   +0.40%     
- Complexity     1003     1010       +7     
============================================
  Files           449      450       +1     
  Lines         10587    10561      -26     
  Branches        514      513       -1     
============================================
+ Hits           2729     2765      +36     
+ Misses         7795     7733      -62     
  Partials         63       63              

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