Add .rm-alias-block to the :not selector for showing external link svg

Today, the theme will add a little link icon next to any external link but excludes any "link" that is actually just an alias to a page.

[this shows the link icon](https://google.com)
[this does not show the link icon]([[November 23rd, 2020]])

It would be nice if this applied to block references as well as page references.

[this currently shows a link icon but likely shouldn't](((44RcQMcMq)))

Here is the part of the codebase that likely needs changing:

Line 168 in 1a63199

div.roam-article span > a:not(.rm-alias-page):after {

Fixed, thanks!