Improve documentation and README

[erdlet]

• Remove version of Jakarta MVC
• Add hint which Jakarta EE version is assumed as default

Improve quickstart documentation

• Remove duplicated information
• Fix parsing issues in XML listings
• Remove most of CXF specific information
• Remove information about 'context.xml' as there are no problems without it (at least T. Erdle couldn't encounter them)
• Remove detail information about Thorntail

Update copyright date

Replace JAX-RS with Jakarta REST inside quickstart

Extend missing documentation

• Describe common configuration properties
• Describe out of the box view engines
• Describe the Krazo SPIs

Describe how view engine can be implemented

Replace GitHub CI badge with Jenkins badge

fixes: #330