gitlab-ci.yml: remove condition that allows gstlal-burst build failure since it is working properly now

Added documents dependencies that weren't in the gstlal-dev:stretch-mkl container. Added support for burst. 

2. Temp. disabling fix/hack from docs makefile. I *think* it works now; not quite sure what gitlab is doing.
3. Adding offline tuturial makefile. currently the test is allowed to fail until we get it working.