refactor: remove unused code for facebook login

Author: khadkarajesh

app/src/main/AndroidManifest.xml

@@ -10,23 +10,6 @@
             android:supportsRtl="true"
             android:name=".AuthApp"
             android:theme="@style/AppTheme">
-        <meta-data android:name="com.facebook.sdk.ApplicationId"
-                   android:value="@string/facebook_app_id"/>
-
-        <activity android:name="com.facebook.FacebookActivity"
-                  android:configChanges=
-                          "keyboard|keyboardHidden|screenLayout|screenSize|orientation"
-                  android:label="@string/app_name" />
-        <activity
-                android:name="com.facebook.CustomTabActivity"
-                android:exported="true">
-            <intent-filter>
-                <action android:name="android.intent.action.VIEW" />
-                <category android:name="android.intent.category.DEFAULT" />
-                <category android:name="android.intent.category.BROWSABLE" />
-                <data android:scheme="@string/fb_login_protocol_scheme" />
-            </intent-filter>
-        </activity>
 
         <activity android:name=".MainActivity">
             <intent-filter>