Refactor wallabag conversion to have simple cli

wallabag2hoarder/README.md

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+# wallabag2hoarder
+
+Currently supports 2 conversions:
+
+- ./convert_netscape.py:
+    Converts into the 'netscape bookmark' format which hoarder should understand as 'html' import.
+    It's a very lossy conversion, essentially only retaining url, title and creation time.
+    Not tested well.
+
+- ./convert_native_json.py:
+    Uses the fact that wallabag outputs json and hoarder supports a native json export/import to
+    transform the json into one that hoarder understands well. More tested, and works without a
+    hitch, _however_ does not correctly transfer any annotations made in wallabag. Annotations
+    are added as a simple json object to the 'note' field in hoarder.
+
+- ./convert_api.py:
+    _WIP_: Uses the public hoader API to move the wallabag articles over, _including_ annotations
+    at a best-effort. Annotation support is a little behind the curve in hoarder -- we can only
+    have highlights, not 'notes' attached to a highlight.