Small cleanup with mdl and markdownlint-cli
Small cleanup with mdl and markdownlint-cli

 In general I agree that bare URLs are bad and some lines in the links
 section are too long, but this is a good improvement, and low hanging
 fruit.

zbeekman/opencoarrays,zbeekman/opencoarrays,sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays,sourceryinstitute/opencoarrays,zbeekman/opencoarrays