Prepare upgrade

[IvanKiral]

Motivation

Which issue does this fix? Fixes #138 #137 #139

If no issue exists, what is the fix or new feature? Were there any reasons to fix/implement things that are not obvious?

Checklist

• Code follows coding conventions held in this repo
• Automated tests have been added
• Tests are passing
• Docs have been updated (if applicable)
• Temporary settings (e.g. variables used during development and testing) have been reverted to defaults

How to test

If manual testing is required, what are the steps?

[codecov]

Codecov Report

❗ No coverage uploaded for pull request base (master@1e1486f). Click here to learn what that means.
The diff coverage is n/a.

@@           Coverage Diff            @@
##             master    #140   +/-   ##
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  Coverage          ?   8.70%           
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  Files             ?      64           
  Lines             ?     942           
  Branches          ?      35           
========================================
  Hits              ?      82           
  Misses            ?     857           
  Partials          ?       3           

📣 We’re building smart automated test selection to slash your CI/CD build times. Learn more

[pokornyd]

Some legacy references fixed, otherwise looking good.

[pokornyd]

noticed there's a Wiki. should be updated and moved to root folder docs

[pokornyd]

disabled the wiki as it references no longer existing sources and materials. it primarily explains preview URL configuration, which is thoroughly explained in Kontent.ai docs