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/rank.html).*
+
+# Circled Horizontal Bar With Notch (`⎉`)
+    
+## `𝔽⎉𝕘 𝕩`, `𝕨 𝔽⎉𝕘 𝕩`: Rank
+    
+Apply `𝔽` to cells at ranks given in `𝕘`.
+    
+The ranks applied are given by the following:
+    
+- `⎉ c`    Rank-c cells of `𝕩` (monadic) or both arguments (dyadic)
+- `⎉ b‿c`   ⍝ Rank-b cells of `𝕨` and rank-c cells of `𝕩` (dyadic)
+- `⎉ a‿b‿c`   ⍝ Rank-a cells of `𝕩` (monadic), b-cells of `𝕨` and c-cells of `𝕩` (dyadic)
+    
+    
+           a ← 3‿2‿4⥊"ABCDEFGHIJKLMNOPQRSTUVWXYZ"
+
+           ⌽⎉2 a
+
+