Update links to original data sources

[szhorvat]

Links to some original data sources are broken.

Update them when possible, add links when links are not present, prefer persistent identifiers such as DOIs.

• UKfaculty
• kite
• enron docs: add 2 DOIs for enron #36
• foodwebs docs: fix README CI badges ,and links #35
• immuno docs: fix README CI badges ,and links #35
• karate docs: add DOI for karate #37
• Koenigsberg docs: add reference for Koenigsberg data, improve Wikipedia link #42
• lesmis docs: add reference for lesmis #43
• macaque docs: add DOI for macaque dataset #44
• rfid docs: add DOI for rfid data #45
• USairports docs: fix README CI badges ,and links #35
• yeast docs: fix README CI badges ,and links #35

[szhorvat]

@maelle, since you're assigned to #8, do you think you could look at this as well?

[maelle]

yes. The urlchecker package will help with this.

[maelle]

I'll come back to this later this week or next to open more DOI PR.

[maelle]

@szhorvat what paper could we use instead of https://en.wikipedia.org/wiki/Seven_Bridges_of_K%C3%B6nigsberg? (actually the manual page even links to the German Wikipedia page at the moment 😅 )

[maelle]

OMG "lesmis" is for "Les Misérables", I was pronouncing it so wrong 😂

[maelle]

lesmis comes from igraph/rigraph#511, what's the source/reference for it @ntamas @szhorvat?

[szhorvat]

Can you investigate from here? https://websites.umich.edu/~mejn/netdata/

[schochastics]

If you want to be super correct with the Königsberger bridgesm, I think it should be

Leonhard Euler, “Solutio problematis ad geometriam situs pertinensis”
Commentarii Academiae Scientarum Imperialis Petropolitanae, 8 (1736), 128–140 + Plate VIII.