Migrate EF websites to our new preview framework

Related to eclipsefdn/helpdesk#1978 (closed)

Deploy Preview for eclipsefdn-openmobility failed.

Name	Link
Latest commit	0f9e49b4
Latest deploy log	https://app.netlify.com/sites/eclipsefdn-openmobility/deploys/633b0efc5b5e540008041e14

mentioned in issue eclipsefdn/helpdesk#1978 (closed)

Deploy Preview for openmobility.eclipse.org is ready [ 2 min 3 sec]

Inspect the build logs

Test locally docker run -it --rm -p 18181:8080 docker.io/eclipsefdn/openmobility-eclipse-org:mr-45--0f9e49b-b1 and open to http://localhost:18181

Browse the preview: https://preview-45--openmobility-eclipse-org.eclipsecontent.org/

mentioned in commit 54497028

merged