feat(dashboard): add tos/privacy/about pages, add delete all data page + endpoint

Catalogger.Frontend/src/routes/about/privacy.md

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+# Privacy policy
+
+We're not lawyers and never will be, and we don't want to write a document no one can (or wants to) read.  
+That being said, this bot handles sensitive information, so here's a list of what the bot collects.
+
+By using Catalogger's commands, or by participating in a server where it's logging events,
+you consent to have your data processed by the bot.
+
+This is the data Catalogger collects:
+
+- Messages, in servers where edited and/or deleted message logging is enabled.
+- Server-specific settings: which channels to log to, and which channels to ignore.
+
+You can opt out of your messages being collected by leaving servers the bot is in.  
+Because this data is stored for moderation purposes, you cannot opt out while still staying in those servers.
+
+Messages are stored encrypted in the database, and automatically deleted after fifteen days.  
+This retention time may be lowered in the future.
+
+This is the data Catalogger fetches from Discord, and is stored while the bot is running:
+
+- User information: IDs, usernames, and avatars.
+- Member information: Nicknames and roles.
+- Server information: all channels and all roles in a server.
+- Webhooks used for logging.
+
+Additionally, the dashboard collects the following data:
+
+- The servers a logged-in user is in, to check their permissions and provide a list of all servers they can manage.
+
+To clear your server's data, use the "Delete all data" page on the dashboard.
+Catalogger will automatically leave your server after confirmation.
+
+Note that that command won't remove any data from database backups. [Contact us](/about/contact) if you want those wiped too.