recreated the logo as a true SVG
openra.net migration
Merge pull request #202 from Mailaender/openra.net

Change links to the new openra.net domain
Merge pull request #201 from Mailaender/svg-logo

Recreated the logo as a true SVG
adapt the size to match again
Merge pull request #203 from Mailaender/svg-logo-followup

Fixed the logo size