GitHub related files and templates

Moving the README out of the actual site code and creating some new files GitHub can use such as PR templates.

Added ISSUE_TEMPLATE.md in case people encounter actual bugs with the site or perhaps the API JavaScript on the homepage. Make sure they include stuff like browser information.
Added PULL_REQUEST_TEMPLATE.md primarily to encourage people to add to the wiki instead of this website.
Added CODEOWNERS and listed myself, as I'm essentially maintaining this site and would like to be auto-assigned to review any PRs that aren't mine.
Moved README.md to .github so it isn't part of the site code.

opennic / opennic-web