docs: remove swagger documentation

Related to #20 (closed)

What does this MR do and why?

I propose to completely delete swagger docs because

• we should only have a single source of documentation (postman collection)
• swago does not have a great documentation :/
• postman is easier to use and maintain and since we use is to tests API
  • examples, secret sharing, do not have to build it every time...
• docs were not up to date for few month and no one had noticed
• in swago it's easy to let a mistake since rules are in comment

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Quality

• For the code that this change impacts, I believe that the automated tests validate functionality that is highly important to users. If the existing automated tests do not cover this functionality, I have added the necessary additional tests or I have added an issue to describe the automation testing gap and linked it to this MR.
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