linked to the code of conduct document

separated the code of conduct in its own file

bumping release number due to note model changes

reinstating the newlyAdded property

minor improvement in legibility and clarity, plus removing the newlyAdded tags

updating note types with the latest css and js changes that accommodate other backgrounds for other tags

minor improvement in legibility

minor improvements in legibility

small improvements in readability

improved advice for contributing changes using git

changed the recommendation for the frequency of updating to weekly, to reflect the lower activity in this deck lately

corrected an error in README - the background appears for cards tagged with the 'covid-19' tag, rather than depending - anymore - on the deck they're in

updated README with the changes in the CrowdAnki plugin

adding changelog for recent changes and in preparation for release 3.2.0

#4 consulting original sources, rather than wikipedia articles for some of the notes and, in the process, clarifying some of the answers