[Doxygen] More extra-pages for cards/developer documentation and various fixes (#6316)

* Docu stash

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* Remove file headers.

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* Group to card set.

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* More extra pages.

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* Small fix for now.

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* Update doc/doxygen-extra-pages/developer_documentation/primer_cards.md

Co-authored-by: RickyRister <42636155+RickyRister@users.noreply.github.com>

---------

Co-authored-by: Lukas Brübach <Bruebach.Lukas@bdosecurity.de>
Co-authored-by: RickyRister <42636155+RickyRister@users.noreply.github.com>

doc/doxygen-extra-pages/user_documentation/deck_management/exporting_decks.md

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+@page exporting_decks Exporting Decks
+
+# Where to export?
+
+There are two screens in the client which can be used to import decks, depending on the context.
+
+- The deck editor tab
+- The deck storage tab (not to be confused with the visual deck storage tab)
+
+# The Deck Editor Tab
+
+The deck editor tabs (Classic and Visual) offer three ways of export a deck:
+
+- To a file on your local storage
+- To your clipboard
+- To an online service
+
+## Local File Storage
+
+To save a deck to a file on your local storage, select the "Save Deck" action in the "Deck Editor" or "Visual Deck
+Editor" menu in the application menu bar at the top of the screen. Alternatively, you can use the shortcut Ctrl/Cmd + S
+to access this action.
+
+Selecting this action will open a file picker dialog provided by your operating system. Simply enter a file name and
+select a format (.cod is recommended) and confirm.
+
+Just below the "Save Deck" action described above is the "Save Deck as..." option, which allows saving an existing file
+under a different filename, which is useful for saving a different version or copy of a deck.
+
+## From Clipboard
+
+To save a deck to your clipboard, select the "Save deck to clipboard..." action in the "Deck Editor" or "Visual Deck
+Editor" menu in the application menu bar at the top of the screen. Alternatively, you can use the shortcut Ctrl/Cmd +
+Shift + C or Ctrl/Cmd + Shift + R to access this action.
+
+Selecting this action will save the currently open deck list to your clipboard.
+
+Saving the decklist without annotations will export the decklist, with each card being described in the following format
+
+```
+CARD_AMOUNT CARD_NAME (SET_SHORT_NAME) CARD_COLLECTOR_NUMBER
+```
+
+There is also the (no set info) option, which will simply export each card as
+
+```
+CARD_AMOUNT CARD_NAME
+```
+
+Mainboard and sideboard are delimited by a newline like so:
+
+```
+1 MainboardCard
+1 OtherMainboardCard
+
+1 SideboardCard
+```
+
+Saving the decklist as annotated will insert comments (marked with // in front of them).
+It will first insert the name and any comments associated with the deck before separating each deck section into its own
+newline delimited and annotated group.
+
+Example: TODO: Adjust this to be non mtg based.
+
+```
+// Deck Name
+
+// Deck Comment
+
+// 10 Maindeck
+// 6 Artifact
+2 The Darkness Crystal (FIN) 335
+2 The Fire Crystal (FIN) 337
+2 Black Mage's Rod (FIN) 90
+
+// 6 Sorcery
+2 Nibelheim Aflame (FIN) 339
+4 Cornered by Black Mages (FIN) 93
+
+// 6 Sideboard
+// 6 Creature
+SB: 4 Blazing Bomb (FIN) 130
+SB: 1 Garland, Knight of Cornelia (FIN) 221
+SB: 1 Undercity Dire Rat (FIN) 123
+```
+
+## From an online service
+
+To export a deck to an online service, select the "Send deck to online service..." action in the "Deck Editor" or "
+Visual Deck Editor" menu in the application menu bar at the top of the screen.
+
+Selecting this action will open your browser with the selected service open and the deck list information from the
+client supplied to it.
+
+Currently supported services are DeckList and TappedOut.