Update Narayana release script

Following changes are needed for Narayana release script:

• Documentation was completely changed by JBTM-2281, thus links have to be changed
• New API bundle was introduced with JBTM-2286. It should be used instead of separate JTA, JTS, XTS, RTS archives
• Upload download links to the new web page via github
• Replace extracted versions of documentations on the web page
• Update narayana release process doc
• Update webpage update readme