WIP Fix templates choose default template

[carkod]

Done

Modified new issue url in the footer from https://github.com/canonical/canonical.com/issues/new to https://github.com/canonical/ubuntu.com/issues/new?template=ISSUE_TEMPLATE.md which uses a default template.

QA

• Check out this feature branch
• Run the site using the command ./run serve or dotrun
• View the site locally in your web browser at: http://0.0.0.0:8001/
  • Be sure to test on mobile, tablet and desktop screen sizes
• [List additional steps to QA the new features or prove the bug has been resolved]

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