Add explanation on how to install brave

ManuSurface/ManuSurfaceSetup.md

@@ -4,9 +4,51 @@ The steps described here allow the creation of a linux system on a Surface Book
   - Rename host
   - Install Brave
     - ```bash
-      mkdir -p ~/.chromium-extensions/youtube-music-dl
-      wget https://github.com/dougppaz/youtube-music-dl/releases/download/v1.2.1/youtube-music-dl.zip
-      unzip youtube-music-dl.zip -d ~/.chromium-extensions/youtube-music-dl
+      sudo apt install -y wget unzip jq apt-transport-https curl
+
+      sudo curl -fsSLo /usr/share/keyrings/brave-browser-archive-keyring.gpg https://brave-browser-apt-release.s3.brave.com/brave-browser-archive-keyring.gpg
+      echo "deb [signed-by=/usr/share/keyrings/brave-browser-archive-keyring.gpg arch=amd64] https://brave-browser-apt-release.s3.brave.com/ stable main" | sudo tee /etc/apt/sources.list.d/brave-browser-release.list
+      sudo apt update
+      sudo apt install -y brave-browser
+
+      archiveName=$(mktemp)
+      wget https://github.com/dougppaz/youtube-music-dl/releases/download/v1.2.1/youtube-music-dl.zip -O $archiveName
+
+      extensionName=youtube-music-dl
+      contextRoot=$(mktemp -d)
+      extensionDir=$contextRoot/$extensionName
+      keyFile=$extensionDir.pem
+      extensionFile=$extensionDir.crx
+      manifestFile=$extensionDir/manifest.json
+
+      extensionRoot=/usr/share/brave-extensions
+      destination=$extensionRoot/$extensionName.crx
+      sudo mkdir -p $extensionRoot
+
+      unzip $archiveName -d $extensionDir
+      brave-browser --pack-extension=$extensionDir
+      manifest="$(cat $manifestFile | jq ". + {key: "'"'"$(openssl rsa -in $keyFile -pubout -outform DER | openssl base64 -A)"'"'"}")"
+      manifest="$(echo $manifest | jq ".background.persistent = false")"
+      echo $manifest > $manifestFile
+
+      extensionID=$(openssl rsa -in $keyFile -pubout -outform DER | shasum -a 256 | head -c32 | tr 0-9a-f a-p)
+      extensionVersion=$(cat $manifestFile | jq -r '.version')
+      brave-browser --pack-extension=$extensionDir --pack-extension-key=$keyFile
+      
+      sudo cp $extensionFile $extensionRoot
+
+      configRoot=/opt/brave.com/brave/extensions/
+
+      sudo rm -rf $contextRoot
+      sudo chmod -R a+rx $extensionRoot
+      sudo chmod -R u+w $extensionRoot
+      sudo mkdir -p $configRoot
+      {
+          echo "{"
+          echo '    "external_crx": "'"$destination"'",'
+          echo '    "external_version": "'"$extensionVersion"'"'
+          echo "}"
+      } | sudo tee $configRoot/$extensionID.json
       ```
   - Install Bitwarden
   - Install Xournal++