Patch: support normal Blogfeed

[florhizome]

I finally managed to upload this (wrote you on Twitter about this):
I patched the bi-directional-links plugin so that links in a traditional blogfeed in posts are supported, and those nodes show up in the Graph.

florhizome@5ac71e7

I just extracted this for now from my local repo since it was quite behind and a general mess, to be able to share it^^. The necessary steps are pretty easy though and should be understandable fromjust looking at the diff. I just change some local variables. A new one (all_nodes) had to be introduced since we could not simply anymore say that all links that are to be shown in the graph are in all_notes.

Technically this would be possibly for any new collection - think of a library subpage [like Maggie Appleton has] (https://maggieappleton.com/library), where you would probably want to have a differentiated template for your "Notes". (and a feed.)

If you want to integrate it in the template, I would suggest thinking about exposing these variables (collections where links are generated and where graph-nodes are generated) to be possibly set directly in the config file, so that users don't have to rewrite the plugin everytime they want to add a collection. Well, we can discuss this further^^. But for now, I just wanted to be able for ppl to see this, lol.