z.md: add page (#1442)

pages/common/z.md

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+# z
+
+> Tracks your most used directories and enable quick jumping using regexes from the command line.
+
+- Go to a directory that contains foo:
+
+`z {{foo}}`
+
+- Go to a directory that contains foo and then bar:
+
+`z {{foo}} {{bar}}`
+
+- Go to the highest ranked directory matching foo:
+
+`z -r {{foo}}`
+
+- Go to the most recently accessed directory matching foo:
+
+`z -t {{foo}}`
+
+- List all directories matching foo (from z database):
+
+`z -l {{foo}}`
+
+- Remove the current directory from the database:
+
+`z -x .`