The community has a page, and the page is its invite

A fourth About page, `Join Discord`, sitting between the author and the ask:
what is this, who made it, where is everyone, how do I help. Like its three
siblings it is written markdown under assets/pages, reads nothing and
transmits nothing, and keeps a CLI face — `meshterm discord`.

It is short on purpose. The invite link, and the code for it in a `qr` fence,
because on a PicoCalc there is no clipboard and the code is how a link leaves
the screen at all.

Co-Authored-By: Claude Opus 5 (1M context) <noreply@anthropic.com>

meshterm/ui/about.py

@@ -1,6 +1,6 @@
 """The About MeshTerm pages: the app, the person who wrote it, and how to help it along.
 
-Three read-only pages hung under the main menu's *About MeshTerm* section — the one
+Four read-only pages hung under the main menu's *About MeshTerm* section — the one
 section that names a subject rather than a doing, because "what is this thing, and who
 made it" is a question the other five can't answer. Each opens as a full screen, scrolls
 if the terminal is short, and is left with Esc; nothing here touches the radio or the
@@ -72,6 +72,15 @@ def about_author() -> MarkdownDoc:
     return _page("author")
 
 
+def join_discord() -> MarkdownDoc:
+    """The *Join Discord* page: the invite link, and a QR of it to point a phone at.
+
+    A page rather than a popup because there is nothing to decide — it is a link, and on
+    a headless console the QR *is* how the link gets off the screen.
+    """
+    return _page("discord")
+
+
 def support_project() -> MarkdownDoc:
     """The *Support MeshTerm* page: what keeps it going, and how to chip in.
 
@@ -166,6 +175,7 @@ __all__ = [
     "AboutPage",
     "about_author",
     "about_meshterm",
+    "join_discord",
     "open_about_page",
     "support_project",
 ]