[Docs] Update meetings info
[Docs] Update meetings info

* Add link to release meeting logs & info about its time
* Change the main meeting time to Mondays, 14:00 UTC

Change-Id: I08db6b1de65f19451f3f018cc7e888cdf2303593

afaheem88/rally,group-policy/rally,vefimova/rally,group-policy/rally,openstack/rally,redhat-openstack/rally,vponomaryov/rally,eayunstack/rally,gluke77/rally,gluke77/rally,openstack/rally,pyKun/rally,cernops/rally,pyKun/rally,afaheem88/rally,vganapath/rally,aforalee/RRally,openstack/rally,gluke77/rally,aplanas/rally,yeming233/rally,vganapath/rally,amit0701/rally,amit0701/rally,amit0701/rally,paboldin/rally,shdowofdeath/rally,gluke77/rally,cernops/rally,eayunstack/rally,vganapath/rally,vefimova/rally,paboldin/rally,aplanas/rally,go-bears/rally,redhat-openstack/rally,aforalee/RRally,go-bears/rally,eonpatapon/rally,group-policy/rally,shdowofdeath/rally,vponomaryov/rally,openstack/rally,paboldin/rally,yeming233/rally,eayunstack/rally,eonpatapon/rally,vganapath/rally