External Link Feature Logic incorrect

[jlchilders11]

Describe the bug

Coderedcms includes a feature which uses js to go through all anchor tags and set target="_blank" if they point to an external address.

There is some flaw in this logic that causes this to always be true if the site cr_site_url is incorrect

ex. You have a link to '/shop/' hard coded in an anchor tags, with site url being set to www.example.com, but hosted locally at localhost:8000. This should open in the same tab, but is opened in a new tab instead.

Steps to reproduce

Steps to reproduce the behavior:

1. Create a new coderedcms site.
2. Turn on "Open all external links in a new tab" under general settings.
3. Create an internal link on a page (ex. "/shop/")
4. Click on the link.
5. See link open in new tab.

Expected behavior

The link should open in the same tab due to starting with a "/"

[vsalvino]

Reopening per reports of this still happening in 1.0 on Slack.