- Adds examples for Node.js and Golang
- Updates sponsorship verbiage
- Updates video selection
- Removes TestDrive v1

Signed-off-by: Alex Ellis (OpenFaaS Ltd) <alexellis2@gmail.com>

- This change points the roadmap back to the documentation and
GitHub issue trackers
- Draws distinction between OF and OFC.

Signed-off-by: Alex Ellis <alexellis2@gmail.com>

Note, not all `alexellis/github` references should be changed, there are
a number of repos which are not part of the openfaas org, this commit
excludes those.

Signed-off-by: John McCabe <john@johnmccabe.net>

Allow content-type for UI