Rewrite and simplify the background script.

The devtools should be more reliable when switching tabs, closing, reloading etc.
The icon of the extension on the actions bar should light up when on site with solid detected.

Author: thetarnav

.changeset/witty-foxes-lick.md

@@ -0,0 +1,8 @@
+---
+"@solid-devtools/extension": patch
+---
+
+Rewrite and simplify the background script.
+The devtools should be more reliable when switching tabs, closing, reloading etc.
+The icon of the extension on the actions bar should light up when on site with solid detected.
+