Remove deprecated and add proxy server example

proxy/extension/README.md

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+This folder contains an extension which can be used with both Chrome and Firefox to proxy twitch.tv m3u8 stream requests.
+
+The target url is set to `http://127.0.0.1/`, you'll want to modify that based on your requirements.

proxy/extension/background.js

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+var isChrome = typeof chrome !== "undefined" && typeof browser === "undefined";
+var extensionAPI = isChrome ? chrome : browser;
+function onBeforeRequest(details) {
+    const match = /hls\/(\w+)\.m3u8/gim.exec(details.url);
+    if (match !== null && match.length > 1) {
+        return {
+            redirectUrl: `http://127.0.0.1/twitch-m3u8/${match[1]}`
+        };
+    } else {
+        return {
+            redirectUrl: details.url
+        };
+    }
+}
+extensionAPI.webRequest.onBeforeRequest.addListener(
+    onBeforeRequest, {
+        urls: ["https://usher.ttvnw.net/api/channel/hls/*"]
+    },
+    ["blocking"]
+);

proxy/extension/manifest.json

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+{
+    "name": "Twitch M3U8 Proxy",
+    "description": "Twitch M3U8 Proxy",
+    "version": "1.0",
+    "manifest_version": 2,
+    "background": {
+        "scripts": ["background.js"],
+        "persistent": true
+    },
+    "permissions": [
+        "webRequest",
+        "webRequestBlocking",
+        "*://*.twitch.tv/*",
+        "*://*.ttvnw.net/*"
+    ]
+}