[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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* Expand on picture loading.

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* Fix line break breaking link.

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* Images and user documentation.

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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/editing_decks_classic.md

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+@page editing_decks_classic Classic Deck Editor
+
+\image html classic_deck_editor.png width=900px
+
+# Editing Basic Deck Information
+
+Editing basic deck information is done through the deck dock widget (DeckEditorDeckDockWidget).
+
+\image html deckeditordeckdockwidget.png
+
+This widget allows editing:
+
+- The name
+- The comments
+- The banner card, which is used to represent the deck in the visual deck storage
+- The tags, which are used for filtering in the visual deck storage
+
+# Adding Cards
+
+Adding cards is done using the list of cards in the database presented in the list view on the left.
+
+\image html classic_database_display.png
+
+Cards can be added by either double-clicking an entry, pressing return with an entry selected to add it to the mainboard
+or pressing ctrl/cmd + return to add it to the sideboard.
+
+There are also buttons for these two functions on the right of the search bar above the list view.
+
+\image html classic_database_display_add_buttons.png
+
+# Modifying the Deck List
+
+To modify or remove cards in the deck list, the tree list view in the deck dock widget can be used.
+
+\image html deck_dock_deck_list.png
+
+Just above the list, at the top right, there are four buttons to manipulate the currently selected card(s):
+
+- Increment Card
+- Decrement Card
+- Remove Card
+- Switch Card between Mainboard and Sideboard
+
+\image html deck_dock_deck_list_buttons.png
+
+Additionally, there is a combo box above the list, which may be used to change how cards are grouped in the list
+display. This is only for visual display and does not affect how the list is saved.
+
+\image html deck_dock_deck_list_group_by.png
+
+# Modifying printings
+
+For more information on modifying the printings in a deck see @ref editing_decks_printings
+