Rename documentation dir to docs
Remove Eclipse project file

Was used for the freeseer-docs repository so Eclipse users did not have
to configure a new Eclipse project just to edit the docs.

If we do want to have an .project file, it should be moved to the
project root. And then we may as well use it for more stuff like
settings tabs to spaces, configuring the run button, and so on.
Remove data directory

Most of the contents were outdated or not used.

All the contents have been moved to Google Drive:
https://drive.google.com/#folders/0B8KSMAVGQMrtX1hQVkQzTnBkTFU

Note that the directory on Google Drive is private. It's only visible
to Freeseer core contributors.
Update links in readme
Remove publishing script

No longer necessary since we've moved away from using multiple repos
on GH to host our raw and built docs.
Update .gitignore
Update docs readme

- Use a reference link for banner

- Remove travis-ci build status, belongs to old repo
Remove sections from readme that we no longer need

[skip ci]
Add some info about read the docs to the docs readme

[skip ci]
Update location to docs directory