Create icon and item to link to Issue Bash from Community page

There's a hole in the list here:

• https://about.gitlab.com/community/

Waiting to be filled by a link to the Issue Bash landing page here:

• https://about.gitlab.com/community/issue-bash/

We need an icon to represent the issue bash. I think a massive hammer will suffice

• Source an image of a big hammer
• Create the link here