Broken Links in Footer

[horizenight]

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Describe the bug
The links

1. Code of Conduct
2. Authors
3. Open Science
4. Contributors
5. Slack Link

in Footer does not work properly!
This is an extension of the above issue

To Reproduce
Steps to reproduce the behavior:

1. Start the application using the yarn start command.
2. Go to localhost:3000 and scroll down to the footer section and click on the slack icon.

Expected behavior
On click of respected links it should open the respective link content

Additional context
This is the extension of issue #223