Archive, multitagging, cleanup

Cleaned up the current snippets for consistency and minor problems, added multiple tags to most of them, archived a few.

snippets/tomorrow.md

@@ -1,7 +1,7 @@
 ### tomorrow
 
 Results in a string representation of tomorrow's date.
-Use `new Date()` to get today's date, adding `86400000` of seconds to it(24 hours), using `toISOString` to convert Date object to string.
+Use `new Date()` to get today's date, adding `86400000` of seconds to it(24 hours), using `Date.toISOString()` to convert Date object to string.
 
 ```js
 const tomorrow = () => new Date(new Date().getTime() + 86400000).toISOString().split('T')[0];