nixos/lighttpd: improve sub-service option types (cgit, gitweb)

nixos/modules/services/web-servers/lighttpd/cgit.nix

···
         cache-size=1000
         scan-path=/srv/git
       '';
-      type = types.string;
+      type = types.lines;
       description = ''
         Verbatim contents of the cgit runtime configuration file. Documentation
         (with cgitrc example file) is available in "man cgitrc". Or online:

nixos/modules/services/web-servers/lighttpd/gitweb.nix

···
 
     projectroot = mkOption {
       default = "/srv/git";
-      type = types.str;
+      type = types.path;
       description = ''
         Path to git projects (bare repositories) that should be served by
         gitweb. Must not end with a slash.
···
 
     extraConfig = mkOption {
       default = "";
-      type = types.str;
+      type = types.lines;
       description = ''
         Verbatim configuration text appended to the generated gitweb.conf file.
       '';