NCA409FP-856: Implement initial bridging mechanism

[isekovanic]

Resolves: https://extranet.netcetera.biz/jira/browse/NCA409FP-856

• [x] Improve the bridget implementation to be initialized as a script whenever a web page is loaded
• [x] Implement article navigation handling
• [x] Implement page navigation handling
• [x] Implement external navigation handling
• [x] Implement removal of specific html components (header, footer etc)
• [x] Implement a sharing mechanism
• [ ] Test social links thoroughly (to make sure they indeed work out of the box as expected)
• [ ] (Optional, to be discussed) Implement client-side definition of what an article should look like (regex)
• [ ] Update integration guide to go in line with all of the changes mentioned above