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/fold.html).*
+
+# Acute Accent (`´`)
+    
+## `𝔽´ 𝕩`: Fold
+    
+Fold over `𝕩` with `𝔽` from right to left i.e. Insert `𝔽` between the elements of `𝕩`.
+    
+           +´ 1‿2‿3
+
+           1+2+3
+
+           -´ 1‿2‿3
+
+           1-2-3
+
+    
+## `𝕨 𝔽´ 𝕩`: Fold With initial
+    
+Monadic fold, but use `𝕨` as initial right argument.
+    
+           5 +´ 1‿2‿3
+
+           1+2+3+5
+
+           5 -´ 1‿2‿3
+
+           1-2-3-5
+
+