improve(migration-guide): Add patch level upgrade

related to #CAM-1720

- remove chapter Migrate your Process Application
improve(enterprise): Provide wls12 distro

related to #CAM-1679

download location must be added with 7.1-alpha2 release

Conflicts:
	site/src/documents/enterprise/chapters/10-downloads/00-downloads.html.md
improve(enterprise): add latest download links
fix(enterprise): download table layout