www/linux-freetube: Add new port

FreeTube is an open source desktop YouTube player built with privacy in mind.
Use YouTube without advertisements and prevent Google from tracking you with
their cookies and JavaScript.

Features:

    - Watch videos without ads
    - Use YouTube without Google tracking you using cookies and JavaScript
    - Subscribe to channels without an account
    - Connect to an externally setup proxy such as Tor
    - View and search your local subscriptions, history, and saved videos
    - Organize your subscriptions into "Profiles" to create a more focused feed
    - Export & import subscriptions
    - Youtube Trending
    - Youtube Chapters
    - Most popular videos page based on the set Invidious instance
    - Watch videos using an external player
    - ... and much more

https://freetubeapp.io/