feat(neovim): add Dockerfile/Compose LSP and treesitter support

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

home/emmatherock/neovim.nix

@@ -45,7 +45,7 @@
       settings.ensure_installed = [
         "nix" "bash" "lua" "markdown" "json" "yaml"
         "rust" "go" "gomod" "c" "cpp" "c_sharp" "python"
-        "javascript" "typescript" "tsx" "vue" "html" "css"
+        "javascript" "typescript" "tsx" "vue" "html" "css" "dockerfile"
       ];
     };
 
@@ -70,6 +70,8 @@
         cssls.enable = true;
         tailwindcss.enable = true;
         jsonls.enable = true;
+        dockerls.enable = true;
+        docker_compose_language_service.enable = true;
       };
       keymaps.lspBuf = {
         "gd" = "definition";