treewide: Change URLs to HTTPS

Lots of URLs were HTTP redirect to HTTPS. Changed those and checked them
if there's actual content. Inspired by
https://github.com/NixOS/nixpkgs/issues/60004

pkgs/data/fonts/ricty/default.nix

@@ -5,7 +5,7 @@ stdenv.mkDerivation rec {
   version = "4.1.1";
 
   src = fetchurl {
-      url = "http://www.rs.tus.ac.jp/yyusa/ricty/ricty_generator-${version}.sh";
+      url = "https://www.rs.tus.ac.jp/yyusa/ricty/ricty_generator-${version}.sh";
       sha256 = "03fngb8f5hl7ifigdm5yljhs4z2x80cq8y8kna86d07ghknhzgw6";
   };
 
@@ -29,7 +29,7 @@ stdenv.mkDerivation rec {
 
   meta = with stdenv.lib; {
     description = "A high-quality Japanese font based on Inconsolata and Migu 1M";
-    homepage = http://www.rs.tus.ac.jp/yyusa/ricty.html;
+    homepage = https://www.rs.tus.ac.jp/yyusa/ricty.html;
     license = licenses.unfree;
     platforms = platforms.unix;
     maintainers = [ maintainers.mikoim ];