remove client side ua parsing

pubspec.lock

@@ -57,13 +57,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "3.0.1"
-  csslib:
-    dependency: transitive
-    description:
-      name: csslib
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.17.1"
   dart_webrtc:
     dependency: "direct main"
     description:
@@ -170,13 +163,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "0.8.1"
-  html:
-    dependency: transitive
-    description:
-      name: html
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "0.15.0"
   http:
     dependency: "direct main"
     description:
@@ -385,20 +371,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "1.3.0"
-  universal_html:
-    dependency: transitive
-    description:
-      name: universal_html
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.8"
-  universal_io:
-    dependency: transitive
-    description:
-      name: universal_io
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.4"
   uuid:
     dependency: "direct main"
     description:
@@ -413,13 +385,6 @@ packages:
       url: "https://pub.dartlang.org"
     source: hosted
     version: "2.1.1"
-  web_browser_detect:
-    dependency: "direct main"
-    description:
-      name: web_browser_detect
-      url: "https://pub.dartlang.org"
-    source: hosted
-    version: "2.0.2"
   webrtc_interface:
     dependency: transitive
     description: