Remove pyenv and add new shell theme

I enjoyed bobthefish quite a bit, but the nerd fonts on the CLI were
screwing up Emacs, and that's a non-starter for me.

One thing I like about cmorrell is that it has the host in the terminal
line, so I can tell which machine I'm on.

config/fish/functions/fish_title.fish

@@ -1,34 +0,0 @@
-# You can override some default title options in your config.fish:
-#     set -g theme_title_display_process no
-#     set -g theme_title_display_path no
-#     set -g theme_title_display_user yes
-#     set -g theme_title_use_abbreviated_path no
-
-function __bobthefish_title_user -S -d 'Display actual user if different from $default_user'
-  if [ "$theme_title_display_user" = 'yes' ]
-    if [ "$USER" != "$default_user" -o -n "$SSH_CLIENT" ]
-      set -l IFS .
-      hostname | read -l hostname __
-      echo -ns (whoami) '@' $hostname ' '
-    end
-  end
-end
-
-function fish_title
-  __bobthefish_title_user
-
-  if [ "$theme_title_display_process" = 'yes' ]
-    echo $_
-
-    [ "$theme_title_display_path" != 'no' ]
-      and echo ' '
-  end
-
-  if [ "$theme_title_display_path" != 'no' ]
-    if [ "$theme_title_use_abbreviated_path" = 'no' ]
-      echo $PWD
-    else
-      prompt_pwd
-    end
-  end
-end