Initial docs rewrite using Vuepress

docs/content/guide/systems.md

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+---
+systemName: My System Name
+---
+
+# Systems
+A *system* is equivalent to an account. Every user of PluralKit must have a system registered to use the bot.
+
+## System IDs
+Each system has a **system ID** - a randomly generated string of 5 letters. You can use this ID to unambiguously refer to a system in commands.
+
+You can see your system ID by running <Cmd-inline>system</Cmd-inline> and looking at the embed footer (at the bottom of the response).
+
+## Creating a system
+To create a system, use the <Cmd-inline>system new</Cmd-inline> command with an optional system name:
+
+<CmdGroup>
+<Cmd>system new</Cmd>
+<Cmd>system new <Arg>My System Name</Arg></Cmd>
+</CmdGroup>
+
+## Editing your system
+
+### System description
+You can set your system description using the following command:
+<Cmd>system description <Arg>My cool system description goes here.</Arg></Cmd>
+
+## Linking accounts
+A system isn't necessarily tied to a single account. A system can be **linked** to another account, and all linked accounts can run commands on behalf of the system.
+
+To link your system to another account, use the following command:
+
+<Cmd>link <Arg>@NameOfAccount#1234</Arg></Cmd>
+
+The other account will need to confirm the link by pressing a reaction within five minutes.
+
+Should you want to unlink an account, use the equivalent unlink account:
+
+<Cmd>unlink <Arg>@NameOfAccount#1234</Arg></Cmd>
+
+You can unlink your own account too (both by mentioning, or using <Cmd-inline>unlink</Cmd-inline> with no account). While you can't unlink the only linked account, be careful not to lock yourself out of your system by other means :slightly_smiling_face:
+
+::: tip
+On both of these commands, you can also supply a user ID. This is useful when you want to unlink an already-deleted account, for example.
+:::