lasuite-docs: mark as linux only

Failing Hydra build: https://hydra.nixos.org/build/328963970

Breaks the build and to my knowledge none of the maintainers / users
will have the bandwidth to debug Darwin issues, so making this state
explicit.

pkgs/by-name/la/lasuite-docs-collaboration-server/package.nix

@@ -64,6 +64,6 @@ stdenv.mkDerivation (finalAttrs: {
       soyouzpanda
       ma27
     ];
-    platforms = lib.platforms.all;
+    platforms = lib.platforms.linux;
   };
 })

pkgs/by-name/la/lasuite-docs-frontend/package.nix

@@ -55,6 +55,6 @@ stdenv.mkDerivation (finalAttrs: {
       soyouzpanda
       ma27
     ];
-    platforms = lib.platforms.all;
+    platforms = lib.platforms.linux;
   };
 })

pkgs/by-name/la/lasuite-docs/package.nix

@@ -181,6 +181,6 @@ python3Packages.buildPythonApplication (finalAttrs: {
       ma27
     ];
     mainProgram = "docs";
-    platforms = lib.platforms.all;
+    platforms = lib.platforms.linux;
   };
 })