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/scan.html).*
+
+# Grave (`` ` ``)
+    
+## ``𝔽` 𝕩``: Fold
+    
+Scan over `𝕩` with `𝔽` from left to right, producing intermediate values.
+    
+    
+           +` 1‿2‿3
+
+           ⟨1, 1+2, (1+2)+3⟩
+
+           -` 1‿2‿3
+
+           ⟨1, 1-2, (1-2)-3⟩
+
+    
+## ``𝕨 𝔽` 𝕩``: Scan With initial
+    
+Monadic scan, but use `𝕨` as initial left argument.
+    
+           5 +` 1‿2‿3
+
+           ⟨5+1, (5+1)+2, ((5+1)+2)+3⟩
+
+           5 -` 1‿2‿3
+
+           ⟨5-1, (5-1)-2, ((5-1)-2)-3⟩
+
+