pop-os: Install htop

Sometimes this laptop seems to start working really hard (The fan turns on) and
I'd like to know what it's doing at that point.

oni/home/config/pop-os.scm

@@ -3,6 +3,8 @@
 		        #:select (home-environment))
   #:use-module ((gnu packages)
 		        #:select (specification->package+output))
+  #:use-module ((gnu packages admin)
+                #:select (htop))
   #:use-module ((gnu packages emacs)
                 #:select (emacs))
   #:use-module ((gnu packages emacs-xyz)
@@ -79,7 +81,8 @@
                  emacs-oni-yaml
                  emacs-oni-web-mode
                  emacs-oni-php
-                 emacs-oni-projectile))
+                 emacs-oni-projectile
+                 htop))
  (services (list home-channels-service
 		 home-environment-service
 		 (service home-emacs-service-type