App to mount hosts based on Steve Boswell's feed of TNFS servers

Steve runs a TNFS sever on his atari8bit.net site, and has a ["Fujinet Server Status" page](https://atari8bit.net/projects/software/fujinet-server-status/) page which includes a a "Other Public TNFS Servers" section at the bottom (as noted in a post to the "FujiNet User's Group" Facebook group [on 2024-04-28](https://www.facebook.com/groups/fujinetusers/posts/3813297325618582/) by @tschak909)

I asked if he could provide a JSON feed, which has done so at: https://atari8bit.net/tnfsservers.php

Output, for example:
```json
{
"data": [
{
"address": "13leader.net",
"owner": "Paul Jones",
"country": "CA",
"updn": "UP",
"desc": "Custom Demo, Games and Homebrew collections"
},
{
"address": "alcatrazbbs.ddns.net",
"owner": "moonlight_mile",
"country": "US",
"updn": "UP",
"desc": "TOSEC, BBS Software"
},
...
```

My thought is there could be an app that reads this JSON, and offers a way for users to (on their Atari/etc.) mount one of the listed TNFS servers in one of their FujiNet's host slots.

Alternatively, provide a way within CONFIG itself to provide the URL to a host list, and choose one from there. (How deep would that rabbit hole go, though?!)

The issue names no files or tests. Start by reviewing the existing fujinet-apps structure and the CONFIG entry point, then decide whether the JSON feed belongs in a separate app or in CONFIG. Done would mean selecting a concrete scope and providing a way to browse the feed and mount a chosen TNFS server.

Written by the indexing model from the issue text.