Add docs page describing command aliases

docs/5-tips-and-tricks.md

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+---
+layout: default
+title: Tips and Tricks
+permalink: /tips
+---
+
+# 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|