adding hands-on workshops sectoion to gathering landing page

[dmueller2001]

not all gatherings will have workshops there may be more than one workshop at a gathering some workshops will be day-long, some will be 1/2 day; some will be 2 hours

sort by time

example:

UXD workshop 10 to 12 on CI/CI in room 2 UXD workshop 1 to 3 pm on OCS in room 2 UXD workshop 8 to 10 am on Console in room 2 Tekton workshop from 9 to 4 pm in room 3 Operators from 9 to 4pm in room 1 IBM hands-on sumthing from 9 to 4PM in room 5

space for description and link to eventbrite to register

for reference: https://events19.linuxfoundation.org/events/kubecon-cloudnativecon-north-america-2019/co-located-events/

[dmueller2001]

Also need to add a tab for the OpenStack afternoon track for both Summit and Amsterdam Gatherings..

main stage/ openstack track/workshop 1/workshop 2/..../workshop N

@jiri-fiala