Remove prefix in link fragments

[realaravinth]

This should be changed to /comment
https://github.com/forgefedv2/interface/blob/ac8a0bbb30e506f4c24032b023d5ee930cad49c5/interface/client.py#L30

On a broader note, I think we should categorize groups together. The reason why we are using constants as opposed to string literals is to make sure a route update is reflected everywhere it's referenced. I think if we create something like this(see below), it will get rid of the inconsistency introduced through _construct_url methods.

{
  "issue":
    {
      "create": "/api/v1/issue/create",
      "comment": "/api/v1/issue/comment"
      }
   }

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Open API spec should be updated if changes are made #23