feat(#2350) Allow relative paths in markdown in docs.

[shawnsarwar]

Description

The patch addresses #2350 : and allows the use of relative paths for links and images in the docs section of collections and requests.

Given this doc string:

The current version cannot display the relative path, but can display the image with a full path.
The rendered html is:

With this patch, the rendered HTML is now correct and the client displays the image:

note! this is hard to replicate on the dev environment because (at least on my machine) neither relative or full path images can be displayed. I suspect this is an issue with permission and electron. Building for your environment through the correct npm action should allow you to validate the behavior.

Contribution Checklist:

• The pull request only addresses one issue or adds one feature.
• The pull request does not introduce any breaking changes
• I have added screenshots or gifs to help explain the change if applicable.
• I have read the contribution guidelines.
• Create an issue and link to the pull request.

Note: Keeping the PR small and focused helps make it easier to review and merge. If you have multiple changes you want to make, please consider submitting them as separate pull requests.

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