* Added <kbd> tag support to markdown editors in article posts and comments.
* Fixed typo in test.
* Fixed test - now compares against inner html.
* Removed .showpage-signi-cta as dead code was reinstated accidentally via git merge.
* Use sass placeholder as no need to output the .kbd class in the css.
* Reinstated original css as accidentally changed with merge.
* Lint and clean up github issue styles
* Use heredoc HTML for easier formatting
* Add better error handling for 404 github issues
* Use custom sanitizer for markdown render
* Refactor unless to ternary
* Rename file and tighten up sanitization
* Fix codepen and instagram tag styling
