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/deshape_reshape.html).*
+
+# Barb (`⥊`)
+        
+## `⥊ 𝕩`: Deshape  
+        
+Put all elements of `𝕩` in a rank 1 array, converting to array if necessary.
+        
+              ⥊ 1
+    
+              ⥊ 1‿2 ≍ 3‿4
+    
+        
+        
+## `𝕨 ⥊ 𝕩`: Reshape
+        
+Put all elements of `𝕩` in an array of shape `𝕨`, adding or removing elements if necessary.
+        
+A single element in `𝕩` can be a function, which will be replaced with an appropriate length:
+- `∘` Exact fit
+- `⌊` Round length down, discarding elements
+- `⌽` Round length up
+- `↑` Round length up, and use element fill to add extra elements.
+        
+              3‿3 ⥊ 3
+    
+              2‿⌽‿2 ⥊ 1‿2‿3
+    
+              2‿↑‿2 ⥊ 1‿2‿3
+    
+