Readme: Rotten Confluence URL

[loonaticx]

Describe the bug
In the Readme, the hyperlink for "Dynatrace easyTravel" points to a dead Confluence link: https://community.dynatrace.com/community/display/DL/Demo+Applications+-+easyTravel

To Reproduce
Steps to reproduce the behavior:

1. Go to Readme
2. Click on "Dynatrace easyTravel"
3. See error

Screenshots

Desktop:

• Browser: Chrome