Add [] to keybar and help

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+*View this file with results and syntax highlighting [here](https://mlochbaum.github.io/BQN/help/beginarray.html).*
+
+# Left Square Bracket (`[`)
+
+## `[ ...`: Begin array
+[→full documentation](../doc/arrayrepr.md#high-rank-arrays)
+
+Starts a high-rank array. Entries must be separated by `,` or `⋄`. These must have the same shape. They become major cells of the result.
+
+Must end with a corresponding `]`.
+
+        ["abc", "def"]
+
+        [↕4, ↕5]