Add server-specific system tag

docs/content/command-list.md

@@ -42,6 +42,7 @@ Some arguments indicate the use of specific Discord features. These include:
 - `pk;system privacy` - Displays your system's current privacy settings.
 - `pk;system privacy <subject> <public|private>` - Changes your systems privacy settings.
 - `pk;system tag [tag]` - Changes the system tag of your system.
+- `pk;system servertag [tag|-enable|-disable]` - Changes your system's tag in the current server, or disables it for the current server.
 - `pk;system timezone [location]` - Changes the time zone of your system.
 - `pk;system proxy [server id] [on|off]` - Toggles message proxying for a specific server.
 - `pk;system delete` - Deletes your system.

docs/content/user-guide.md

@@ -74,6 +74,23 @@ If you want to remove your system tag, just type `pk;system tag` with no extra p
 to bump it over that limit. PluralKit will warn you if you have a member name/tag combination that will bring the combined username above the limit.
 You can either make the member name or the system tag shorter to solve this. 
     
+### System server tags
+If you'd like to set a system tag (as above), but only for a specific server, you can set the *system server tag*. This will override the global system tag, but only in the server you set it in. For example:
+
+```
+pk;system servertag 🛰️
+```
+
+The server tag applies to the same server you run the command in, so this command doesn't function in DMs.
+
+To remove an existing server-specific system tag, use the command `pk;system servertag -clear`.
+
+::: tip
+It is possible to disable the system tag for a specific server. Use the command `pk;system servertag -disable`.
+
+To re-enable it, use the command `pk;system servertag -enable`.
+:::
+
 ### Adding or removing Discord accounts to the system
 If you have multiple Discord accounts you want to use the same system on, you don't need to create multiple systems.
 Instead, you can *link* the same system to multiple accounts.