[v1.5.2] Bug fix for nodes with keyword-variable parameters

I usually only write a summary of the changes here, detailing them on the commit messages themselves. However, since this was a pretty quick and simple fix, I'll just paste the commit message itself here:

Nodes with keyword-variable parameters (parameters prefixed with **) were being executed in the wrong way due to a bug that caused their arguments to be discarded when more than 01 variable keyword argument was collected.

This nasty bug could either cause all kinds of errors when executing the graph or even worse remain undetected, all due to the unexpected outputs that such nodes produce by ignoring the variable keyword arguments.

It was introduced in v1.5.0, when the entire graph execution mechanism was overhauled in order to adopt the topological sorting algorithm.

We also updated social media links to include the developer's (me) Bluesky profile and also point to the developer's links page, where several other useful links/addresses are available, including email.