fix to handle links with fragments

[degurii]

What this PR does / why we need it?

Fixes URL link navigation with fragments not working properly.

Any background context you want to provide?

In my opinion, when a link contains a fragment in the code mirror, it seems that we cannot retrieve the text including the fragment using token.string. However, since the entire link is wrapped in a link-type span element, I have made changes to extract the url from the element, enabling proper navigation to the correct link.

What are the relevant tickets?

Fixes #248

Checklist

• [x] Added relevant tests or not required
• [x] Didn't break anything

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