Configure qutebrowser for version 2.2

Mostly just renaming a few config directives. Also support launching mpv
from the browser.

.config/qutebrowser/config.py

@@ -295,11 +295,16 @@ c.colors.tabs.selected.even.bg = base02
 
 # %%base16_template_end%%
 
+### END COLOR SCHEME
+
+# Don't autoplay video, especially since we'll export it to MPV
+c.content.autoplay = False
+
 # Sites that honor UA pref will serve dark themes
-c.colors.webpage.prefers_color_scheme_dark = True
+c.colors.webpage.preferred_color_scheme = 'dark'
 
 # Allow notifications
-c.content.notifications = True
+c.content.notifications.enabled = True
 
 # Enable spellcheck
 c.spellcheck.languages = ['en-US']
@@ -310,4 +315,8 @@ c.tabs.background = True
 # Homepage DDG
 c.url.default_page = 'https://start.duckduckgo.com'
 
-config.load_autoconfig
+# Custom bindings
+config.bind(',m', 'spawn mpv {url}')
+config.bind(',M', 'hint links spawn mpv {hint-url}')
+
+config.load_autoconfig()