* Restructured the pipelines docs.
* Added redirects for the deleted files.
* Standardized use of full stop in descriptions.
* More full stops.
* Fixed internal links to the moved pages.
* First commit of pipelines tutorial.
* Still in progress: Pipelines end-to-end guide.
* Finished first run of tutorial.
* A few more tidy-ups.
* Set back all the page weights to values in head.
* Reverted change to gpu/tpu line containing page weight.
* Added the finishing touches to the tutorial.
* Updated in response to review comments.
* One more change resulting from review comments.
* In progress: Refactoring the left-hand navigation panel.
* Added .description to section index pages.
* Removed the redundant Components Overview as the new index page of the components section does a better job.
* Added redirects for the files I've moved/deleted.
* Fixed the URLs in all doc links.