[FEATURE] Open all external Markdown links in a new tab.

[missionmike]

Is your feature request related to a problem? Please describe.

Somewhat; for internal links, the current browser window should be used. External links, however, should be opened in a new tab with rel="noopener noreferer"

Describe the solution you'd like

Perhaps it's possible to hook into the link generator and check if it's an internal vs. external link, then apply the <a> attributes accordingly.

Describe alternatives you've considered

Leaving it as-is.

Additional context

N/A