otter-browser: remove

I have no interest in maintaining this anymore and it has no other maintainers.

pkgs/applications/networking/browsers/otter/default.nix

@@ -1,27 +0,0 @@
-{ stdenv, cmake, fetchFromGitHub
-, qtbase, qtmultimedia, qtwebengine, qtxmlpatterns
-, version ? "1.0.01"
-, sourceSha ? "1jw8bj3lcqngr0mqwvz1gf47qjxbwiyda7x4sm96a6ckga7pcwyb"
-}:
-stdenv.mkDerivation {
-  pname = "otter-browser";
-  inherit version;
-
-  src = fetchFromGitHub {
-    owner = "OtterBrowser";
-    repo = "otter-browser";
-    rev = "v${version}";
-    sha256 = sourceSha;
-  };
-
-  nativeBuildInputs = [ cmake ];
-
-  buildInputs = [ qtbase qtmultimedia qtwebengine qtxmlpatterns ];
-
-  meta = with stdenv.lib; {
-    homepage = https://otter-browser.org;
-    license = licenses.gpl3Plus;
-    description = "Browser aiming to recreate the best aspects of the classic Opera (12.x) UI using Qt5";
-    maintainers = with maintainers; [ lheckemann ];
-  };
-}

pkgs/top-level/aliases.nix

@@ -290,6 +290,7 @@ mapAliases ({
   opensans-ttf = open-sans; # added 2018-12-04
   openssh_with_kerberos = openssh; # added 2018-01-28
   osquery = throw "osquery has been removed."; # added 2019-11-24
+  otter-browser = throw "otter-browser has been removed from nixpkgs, as it was unmaintained"; # added 2020-02-02
   owncloudclient = owncloud-client;  # added 2016-08
   p11_kit = p11-kit; # added 2018-02-25
   parquet-cpp = arrow-cpp; # added 2018-09-08

pkgs/top-level/all-packages.nix

@@ -6622,8 +6622,6 @@ in
 
   Sylk = callPackage ../applications/networking/Sylk {};
 
-  otter-browser = qt5.callPackage ../applications/networking/browsers/otter {};
-
   privoxy = callPackage ../tools/networking/privoxy {
     w3m = w3m-batch;
   };