chore: add Tailwind CSS installation to Dockerfile and update devcontainer configuration

.devcontainer/Dockerfile

@@ -2,3 +2,7 @@ FROM mcr.microsoft.com/devcontainers/go:1-1-bookworm
 
 USER vscode
 RUN go install github.com/air-verse/air@latest
+
+USER root
+RUN wget https://github.com/tailwindlabs/tailwindcss/releases/download/v3.4.17/tailwindcss-linux-x64 -O /usr/local/bin/tailwindcss \
+    && chmod +x /usr/local/bin/tailwindcss

.devcontainer/devcontainer.json

@@ -6,7 +6,6 @@
     "service": "app",
     "workspaceFolder": "/workspaces/${localWorkspaceFolderBasename}",
     "features": {
-        "ghcr.io/r3dpoint/devcontainer-features/tailwindcss-standalone-cli:1": {},
         "ghcr.io/dusansimic/devcontainer-features/templ:0": {},
         "ghcr.io/devcontainers-extra/features/fish-apt-get:1": {},
         "ghcr.io/devcontainers-extra/features/go-task:1": {}
@@ -35,14 +34,16 @@
                 },
                 "tailwindCSS.includeLanguages": {
                     "templ": "html"
-                }
+                },
+                "workbench.iconTheme": "material-icon-theme"
             },
             "extensions": [
                 "golang.go",
                 "GitHub.copilot",
                 "tamasfe.even-better-toml",
                 "a-h.templ",
-                "bradlc.vscode-tailwindcss"
+                "bradlc.vscode-tailwindcss",
+                "pkief.material-icon-theme"
             ]
         }
     },