Unindex 0.7 documentation from search engines

[rowansc1]

The old 0.7 docs are still indexed on Google, and some are showing higher than the new 1.0 documentation, which is resulting in users doing incorrect actions (despite the warning on those pages).

Adding a robots.txt file, and tagging effected pages with a noindex tag should eventually stop this, whilst preserving the docs should anyone need them.