add h2s remove copied output, ascii filenames

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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/shiftbefore.html).*
+
+# Left Pointing Double Angle Quotation (`«`)
+    
+## `« 𝕩`: Shift Before
+    
+Remove the first element of `𝕩`,  add a cell of fill values to the end of the first axis of `𝕩`.
+    
+           78 « 1‿2‿3
+
+           « 1‿2‿3
+
+           « 3‿3 ⥊ 9
+
+    
+    
+## `𝕨 « 𝕩`: Shift Before
+    
+Remove the first `≠𝕨` (length) major cells from `𝕩`, join `𝕨` to the end of `𝕩`. Ranks must match.
+    
+           8‿5 « 1‿2‿3
+
+           a ← 3‿3 ⥊ 9
+
+           1‿2‿3 « a
+
+