Removes the first-steps.md as it was moved to wiki
Removes the first-steps.md as it was moved to wiki

Now resides in: https://github.com/pixelated/pixelated-user-agent/wiki/Starting-Development
pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated-project/pixelated-user-agent,pixelated/pixelated-user-agent,pixelated-project/pixelated-user-agent