Merge pull request #55 from razetime/master

Simple help pages for Primitive Symbols 

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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/negate_subtract.html).*
+
+# Minus (`-`)
+    
+## `- 𝕩`: Negate
+    
+Additive Inverse of `𝕩`.
+    
+[Pervasive.](https://mlochbaum.github.io/BQN/doc/arithmetic.html#pervasion)
+    
+          - 1
+
+          - ¯1
+
+    
+## `𝕨 - 𝕩`: Subtract
+    
+Subtract `𝕩` from `𝕨`. `𝕨` and `𝕩` can be characters or integers.
+    
+[Pervasive.](https://mlochbaum.github.io/BQN/doc/arithmetic.html#pervasion)
+    
+          1 - 2
+
+          1 - 2‿3‿4
+
+          'a' - 4
+
+          'b' - 'a'
+
+