fix(gatsby-transformer-remark): Fix transformer-remark when using assetPrefix

[xavivars]

Description

Fixed support for assetPrefix with gatsby-transformer-remark

Related Issues

Fixes #15514

[xavivars]

@DSchau, you may want to look at this PR. It's a leftover of #12128

[wardpeet]

Looks good! thanks for doing this! 🥇

Can you create a test with a relative link too?

[xavivars]

@wardpeet do you mean one that doesn't start with /? Or one for the case where assetPrefix is not used?

If it's the second, the test already exists.

[wardpeet]

first one :) so where it doens't start with / but maybe ./ or just relative my-pages/test

[wardpeet]

Let's ship it 🛳! Thanks for fixing 🙏💪

[gatsbot]

Holy buckets, @xavivars — we just merged your PR to Gatsby! 💪💜

Gatsby is built by awesome people like you. Let us say “thanks” in two ways:

1. We’d like to send you some Gatsby swag. As a token of our appreciation, you can go to the Gatsby Swag Store and log in with your GitHub account to get a coupon code good for one free piece of swag. We’ve got Gatsby t-shirts, stickers, hats, scrunchies, and much more. (You can also unlock even more free swag with 5 contributions — wink wink nudge nudge.) See gatsby.dev/swag for details.
2. We just invited you to join the Gatsby organization on GitHub. This will add you to our team of maintainers. Accept the invite by visiting https://github.com/orgs/gatsbyjs/invitation. By joining the team, you’ll be able to label issues, review pull requests, and merge approved pull requests.

If there’s anything we can do to help, please don’t hesitate to reach out to us: tweet at @gatsbyjs and we’ll come a-runnin’.

Thanks again!

[pieh]

Published gatsby-transformer-remark@2.6.2