Update parser and data

[leonardovida]

• Update parser
• Create yaml files for each entry: from now on a contributor only needs to add a new yaml file
• Add the template of a new entry: still to be finished still
• Check for dead urls: still not sure about the working of emojis...

[leonardovida]

TODOs

• [x] Fix contributing section
• [x] Fix contributing template
• [x] Add git action to build the documentation
• [x] Fix bug: contributing section not showing up in TOC