Improve Docs (#151)

* Added configurable command prefix

* Added getting started, renamed files

* Add nav order, add assests, add system example

* Added a lot

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docs/7-tips-and-tricks.md

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+---
+layout: default
+title: Tips and Tricks
+permalink: /tips
+nav_order: 7
+---
+
+# Tips and Tricks
+
+## Use command shorthands
+PluralKit has a couple of useful command shorthands to reduce the typing:
+
+|Original|Shorthand|
+|---|---|
+|pk;system|pk;s|
+|pk;system list|pk;s l|
+|pk;system list full|pk;s l f|
+|pk;system fronter|pk;s f|
+|pk;system fronthistory|pk;s fh|
+|pk;system frontpercent|pk;s fp|
+|pk;member|pk;m|
+|pk;member new|pk;m n|
+|pk;switch|pk;sw|
+|pk;message|pk;msg|
+|pk;autoproxy|pk;ap|
+
+## Permission checker command
+If you're having issues with PluralKit not proxying, it may be an issue with your server's channel permission setup.
+PluralKit needs the *Read Messages*, *Manage Messages* and *Manage Webhooks* permission to function.
+
+To quickly check if PluralKit is missing channel permissions, you can use the `pk;permcheck` command in the server
+in question. It'll return a list of channels on the server with missing permissions. This may include channels
+you don't want PluralKit to have access to for one reason or another (eg. admin channels).
+
+If you want to check permissions in DMs, you'll need to add a server ID, and run the command with that.
+For example: `pk;permcheck 466707357099884544`. You can find this ID
+[by enabling Developer Mode and right-clicking (or long-pressing) on the server icon](https://discordia.me/developer-mode).