Separate entries by year and make DOI+arXiv human-readable

[sloede]

I propose two changes and a small addition:

1. Separate entries by year: This makes it easier to find the most recent ones and gives immediate visual feedback on the vibrancy and timeliness of the data.
2. Separately encode DOI and arXiv: I am not a fan of making the title a clickable link. Why? Because I don't like to click on stuff where I don't know where it will take me. If the links are explicitly given as DOI and arXiv links, however, I am too lazy/gullible to check and just assume that they will take me to the expected pages. As noted by @ranocha in the chat, I also think we should include arXiv whenever possible to be more inclusive towards people without institutional access to traditional publications.
3. Add a statement on contributions: If possible, people should be encouraged to add missing information. I found that for this to happen, the entry barrier should be as low as possible, thus I suggest to include the link to the repo here as well (even though it can be found elsewhere on the website too).

[ranocha]

This sounds like a good idea to me 👍

[giordano]

Thanks!