feat(tazjin/nittredir): Add Chrome extension to redirect to Nitter

There is another extension for this already, but it hooks in after the
page has already started loading - doing it on the URL change handler
is much faster.

Change-Id: I442552cbd8bb040df999a1624cafd436f4a7b875
Reviewed-on: https://cl.tvl.fyi/c/depot/+/2430
Reviewed-by: tazjin <mail@tazj.in>
Tested-by: BuildkiteCI

users/tazjin/nittredir/manifest.json

@@ -0,0 +1,15 @@
+{
+  "manifest_version": 2,
+  "name": "nittredir",
+  "version": "1.0",
+  "description": "Redirect twitter.com to nitter.net",
+  "background": {
+    "scripts": ["background.js"],
+    "persistent": true
+  },
+  "permissions": [
+    "webRequest",
+    "webRequestBlocking",
+    "*://twitter.com/*"
+  ]
+}