chore(community/contrib): add community extensions

related to #CAM-1861
Merge branch 'master' into live
Merge branch 'master' into live
chore(download): remove AS logos
fix(download): fix zip button highlighting
chore(css): remove AS logo container
Merge branch 'master' into live
chore(contribute): add rules for java projects
Merge branch 'master' into live
updt(users): add generali as reference customer
chore(release): add alpha4 to download page
chore(release-notes): add release notes to alpha4 download
fix(blog): change description to summary.content

because of changings in the blog direct we need to change our decoding
fix(getting started): change assignee name

align assingee name in pic with name in text --> john
updt(users): change logo and text of racon
fix(meetings): change meetings.php to network.php as proxy