Fill in some blanks in the readme.

README.md

@@ -1,6 +1,8 @@
 # Tilde Friends
 Tilde Friends is a tool for making and sharing.
 
+A public instance lives at https://www.tildefriends.net/.
+
 It is both a peer-to-peer social network client, participating in Secure
 Scuttlebutt, as well as a platform for writing and running web applications.
 
@@ -11,6 +13,9 @@ Scuttlebutt, as well as a platform for writing and running web applications.
    browser.
 
 ## Building
+Builds on Linux (x86_64 and aarch64), MacOS, OpenBSD, and Haiku.  Builds for
+all of those host platforms plus mingw64, iOS, and android.
+
 1. Requires openssl (`libssl-dev`, in debian-speak).  All other dependencies
    are kept up to date in the tree.
 2. To build, run `make debug` or `make release`.  An executable will be
@@ -19,6 +24,7 @@ Scuttlebutt, as well as a platform for writing and running web applications.
    the right dependencies in the right places.  `make windebug winrelease
    iosdebug-ipa iosrelease-ipa release-apk`.
 4. To build in docker, `docker build .`.
+5. `make format` will normalize formatting to the coding standard.
 
 ## Running
 By default, running the built `tildefriends` executable will start a web server
@@ -29,8 +35,8 @@ privileges.  Further administration can be done at
 <http://localhost:12345/~core/admin/>.
 
 ## Documentation
-There are the very beginnings of developer documentation in `apps/docs/`
-that can be read in-place or at <http://localhost:12345/~core/docs/>.
+Docs are a work in progress:
+<https://www.tildefriends.net/~cory/wiki/#test-wiki/tf-app-quick-reference>.
 
 ## License
 All code unless otherwise noted in is provided under the