docs: More docs for FancyDialogs

Author: OliverSchlueter

docs/src/fancydialogs/tutorials/open-dialog-npc-action.md

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 # Open dialog npc action

docs/src/fancydialogs/tutorials/quick-actions.md

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+# Quick actions
+
+FancyDialogs doesn't support the quick-actions hotkey, but has a command to open a quick action dialog.
+To open the quick actions dialog, use the command: `/qa` or `/quickactions`.
+
+You can customize the quick actions dialog in the `plugins/FancyDialogs/data/dialogs/quick_actions.json` file.
+
+If you want to disable the quick actions dialog, you can set the `disable-quick-actions-dialog` option to true in the `plugins/FancyDialogs/featureFlags.yml` file.

docs/src/fancydialogs/tutorials/welcome-dialog.md

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+# Welcome dialog
+
+You can configure a dialog to be shown to players when they join the server for the first time.
+A default welcome dialog is included with FancyDialogs, but you can customize it or create your own welcome dialog.
+
+You can find the default welcome dialog in the `plugins/FancyDialogs/data/dialogs/welcome.json` file.
+Feel free to edit this file to customize the welcome dialog to your liking.
+
+If you want to use another dialog as the welcome dialog, you can change the id in the `plugins/FancyDialogs/config.yml` file by changing the `welcome_dialog_id` option to the ID of your desired dialog.
+
+To completely disable the welcome dialog, you can set the `disable-welcome-dialog` to true in the `plugins/FancyDialogs/featureFlags.yml` file.