Remove nvidia channel from install selector (#712)

* Remove nvidia channel from install selector

* Improve spacing

Author: bdice

_includes/selector.html

@@ -484,9 +484,9 @@
                 var python_version = this.active_python_ver;
                 var cuda_version_pinning = this.getCondaVersionSupport(this.active_conda_cuda_ver)["pinning"];
                 var py_cuda_pkgs = [this.highlightPkgOrImg("python") + "=" + python_version, "'" + this.highlightPkgOrImg("cuda-version") + cuda_version_pinning + "'"].join(" ");
-                var conda_channels = [rapids_channel, "conda-forge", "nvidia"]
-                    .map(ch => "-" + this.highlightFlag("c") + " " + ch + " ")
-                    .join("");
+                var conda_channels = [rapids_channel, "conda-forge"]
+                    .map(ch => this.highlightFlag("-c") + " " + ch)
+                    .join(" ");
                 var indentation = "    ";
 
                 // sort active_packages to appear in the same order as the additional_rapids_packages list