devguide: document alerts' flow - v1

[jufajardini]

Link to redmine ticket: https://redmine.openinfosecfoundation.org/issues/5274

Describe changes:

• changed Doxygen settings to enable call/er graph for static functions
• disabled showing unittests in call/er graphs (only RunUnittests shows now)
• added page about Alerts' flow
• added Detect as one of Suricata engines

This PR is to share what the document is looking like, to get feedback if this is the right direction or not.

[codecov[bot]]

Codecov Report

Merging #7387 (3e70d2c) into master (dfe76bb) will decrease coverage by 0.01%. The diff coverage is n/a.

@@            Coverage Diff             @@
##           master    #7387      +/-   ##
==========================================
- Coverage   75.87%   75.85%   -0.02%     
==========================================
  Files         656      656              
  Lines      190105   190106       +1     
==========================================
- Hits       144236   144207      -29     
- Misses      45869    45899      +30     

Flag	Coverage Δ
fuzzcorpus	60.46% <ø> (-0.07%)	:arrow_down:
suricata-verify	51.75% <ø> (+<0.01%)	:arrow_up:
unittests	61.01% <ø> (-0.01%)	:arrow_down:

Flags with carried forward coverage won't be shown. Click here to find out more.

[catenacyber]

Juliana, what is the status of this draft ?

[jufajardini]

Juliana, what is the status of this draft ?

I must get back to it, I think things with higher priority got my attention and this was temporarily left aside /shame.

[jufajardini]

Closing this for now as it's still a WIP and some higher priority issues got in the way...