Update the season of docs page
Update the season of docs page

This commit updates the Season of Docs webpage for the 2020 edition

Signed-off-by: Robert Winkler <61584657dc1820455f2fd8697cfcb9c8b996c6e4@antmicro.com>

SymbiFlow/symbiflow-website,SymbiFlow/symbiflow-website,SymbiFlow/symbiflow-website