rename doc folder

docs/doxygen/pages/user_documentation/index.md

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+@page user_reference User Reference
+
+## Deck Management
+
+- @subpage creating_decks
+- @subpage importing_decks
+- @subpage editing_decks
+- @subpage exporting_decks
+
+## Release Channels
+
+- @subpage beta_release
+
+## Settings
+
+- @subpage settings_folder
+
+## Card Pictures
+
+- @subpage custom_card_pictures
+
+## Troubleshooting
+
+- @subpage fixing_card_pictures
+- @subpage enabling_debug_logs
+
+## Syntax Help
+
+- @subpage search_syntax_help
+- @subpage deck_search_syntax_help