Add talk/workshop detail section

[inovizz]

We need the website visitors to be able to see the details of the talk proposal when they click on a talk or a workshop. We have details of all the talks selected, someone just needs to create the interface and insert the respective data against each talk/workshop.

[inovizz]

Example - https://pyconf.hydpy.org/2019/index.html#sponsors-section

This link is of Sponsor section, but something similar is what we are looking for.