Rules page implies entries should be video-games only

[pixelsyntax]

https://alakajam.com/article/docs/alakajam-competition-rules reads "The Alakajam! competitions let people make a video game from scratch in a week-end". A recent unlinkable discord discussion clarified that non-video games are also permissable. The documentation should be updated to reflect by removing the implication from the introduction and perhaps by being explicit with examples of what kind of games are permissable.

[pixelsyntax]

Created a pull request #667 to remove 'video' requirement

[mkalam-alami]

Done with #667