Updating the broken links of the wiki

[dschowta]

Some of the broken links of the wiki needs to be updated

• https://github.com/linksmart/data-processing-agent/wiki/CEML-Request-API-(aka-CEML-API)
• https://github.com/linksmart/data-processing-agent/wiki/Model-and-Learning-Process-Concepts
• release repo in wiki home which was linking to nexus repo
• https://github.com/linksmart/data-processing-agent/wiki/Advanced-APIs

[farshidtz]

There are tens of links to code|docs.linksmart.eu. I'd say we leave them because it will be a lot of work for us to fix. Unless @Dasender wants to fix them?