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/occcount_progindex.html).*
+
+# Square Original Of or Equal To (`⊒`)
+    
+## `⊒ 𝕩`: Occurrence Count
+    
+Number of times each major cell of `𝕩` appears before itself.
+    
+            ⊒   2‿7‿1‿8‿1‿7‿1‿8‿2‿8‿4
+
+            ≍⟜⊒ 2‿7‿1‿8‿1‿7‿1‿8‿2‿8‿4
+
+    
+    
+## `𝕨 ⊒ 𝕩`: Progressive Index Of
+    
+Index of the first unused match of each major cell of `𝕩` in `𝕨`. If there are no more matches left, length of `𝕨` is placed in that position.
+    
+            "aaa" ⊒ "aaaaa"
+
+            "aaabb" ⊒ "ababababab"
+
+