Fixes link to docs

This keeps it vague so the link won't break in the future.
Merge pull request #25 from kumar303/docs

Fixes link to docs
fix the docker link. it'd be unclear which page it'd be on if you head to doc's root
fix the link again whoops
Update README.md
Fix link too
bind command to access mp.dev on FxOS devices
Merge pull request #26 from kumar303/bind

bind command to access mp.dev on FxOS devices
Fix comment on wharfie -> marketplace-env
Fix help format in bind options