remove the rust-toolchain file

README.rst

@@ -1,16 +1,11 @@
 ``rustup`` Toolchain
 ====================
 
-If you use ``rustup``, you need to configure what toolchain you want
-to use. We set the default in the file ``./rust-toolchain`` to ``system``:
-
-    # cat rust-toolchain
-    system
-
-This works if you have installed the ``rustc`` Debian packages, and told
-``rustup`` the location of that link:
+We normally want to build with the ``rustc`` Debian package. To do that
+you can set the following ``rustup`` configuration:
 
     # rustup toolchain link system /usr
+    # rustup default system
 
 
 Versioning of proxmox helper crates

rust-toolchain

@@ -1 +0,0 @@
-system