fix: outdated docs and misc cleanup

Also added the new option to the import CLI,
improved tests that only test one file to only import 1 file
and cleaned up some hard to read code

deps/graph-parser/script/db_import.cljs

@@ -193,6 +193,9 @@
    {:alias :P
     :coerce []
     :desc "List of properties whose values convert to a parent class"}
+   :extract-code-snippets?
+   {:alias :C
+    :desc "Extract code fence(s) to #Code"}
    :validate
    {:alias :V
     :desc "Validate db after creation"}})