Add Conference Schedule Page

[marcoroth]

This pull request implements a page for showing the conference schedule for conferences that have a schedule.yml file in their data folder.

This pull request and design is a draft/work in progress.

Resolves #184

[marcoroth]

[marcoroth]

[adrienpoly]

This looks awesome.
It does look also very time consuming to construct. I guess that once it is done , it is done. Do you think we will be able to somehow automate this ?

[marcoroth]

I started to order all talks in running order. The idea here is that if the talks are already in running order in the videos.yml file you only have to "construct" the grid in the schedule.yml file.

Also, this is designed to be gradual. If the conference doesn't have a schedule.yml it doesn't try to display it.

It's a bit more effort per conference, but I think it's worth it.

In the big Picture: if we can use this app to power conference schedules not only for past conferences, but also for current and future ones then this feature becomes crucial, which is why I started to work on it.