Removed 'relative_permalink' in _config.yml

[hmenorjr]

After configuration. Github pages said that the current relative_permalink is no longer supported. Thus removing it in the base code.

[hmenorjr]

Possible solution for #274

[fredster33]

@mdo sorry for the ping, but would you mind taking a look at this, please? Currently Hyde completely does not work on GH pages and fails to build with the following error:

Your site is having problems building: Your site is using the relative_permalinks configuration option. This setting is deprecated as has been removed from the latest version of Jekyll. To ensure your site continues to build as expected, remove the option from your site's configuration and update any post or page permalinks to be absolute to the site root, not the parent folder. For more information, see https://docs.github.com/github/working-with-github-pages/troubleshooting-jekyll-build-errors-for-github-pages-sites#relative-permalinks-configured.

[hmenorjr]

@fredster33 That's what I'm trying to do with this PR. Don't know if @mdo or any admin already merged it.

[hmenorjr]

@chrisglein I don't think I have the write access to this repository

[chrisglein]

@chrisglein I don't think I have the write access to this repository

Me either. Was just trying to help out with a second set of eyes to review. Especially since I hit the same issue.
@mdo, this look good to merge?