[Networking] Doxygen (#7030)

* [Networking] Doxygen

* Lint cause my autolinter is broken lol

* Update.

* Update Doxyfile

Co-authored-by: tooomm <tooomm@users.noreply.github.com>

* Alphabetical ordering

Co-authored-by: tooomm <tooomm@users.noreply.github.com>

* Add new card art rule comment

* move filter program into doxygen folder

* [Networking] Doxygen


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* [Networking] Fix Doxyfile

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Co-authored-by: Lukas Brübach <lukas.bruebach@bdosecurity.de>
Co-authored-by: tooomm <tooomm@users.noreply.github.com>
Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>

doc/doxygen/extra-pages/developer_documentation/index.md

@@ -8,4 +8,6 @@
 - @subpage querying_the_card_database
 
 - @subpage loading_card_pictures
-- @subpage displaying_cards
+- @subpage displaying_cards
+
+- @subpage developer_reference_network_overview