[LIGHT] New heading for docs about the light project (#3156)
[LIGHT] New heading for docs about the light project (#3156)

* Listing quests project

* Moving rl paper to the correct heading

* New heading for LIGHT quests

* Didn't save the merge :(
facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI,facebookresearch/ParlAI