fix(docs-site): fix astro.config.ts (#19929)

Author: RogerLamTd

packages/docs-site/astro.config.ts

@@ -219,10 +219,6 @@ export default defineConfig({
                   label: "Run a node for Taiko Hekla",
                   link: "/guides/node-operators/run-a-node-for-taiko-hekla/",
                 },
-                {
-                  label: "Enable a proposer",
-                  link: "/guides/node-operators/enable-a-proposer/",
-                },
                 {
                   label: "Enable a prover",
                   link: "/guides/node-operators/enable-a-prover/",