fix(docs): fix nightly docs builds (#17073)

There was an issue with the build before cutting the new nightly
release, this PR fixes it.

Author: critesjosh

barretenberg/docs/docusaurus.config.ts

@@ -89,7 +89,7 @@ const config: Config = {
           lastVersion: versions[1],
           versions: {
             [versions[0]]: {
-              path: "nightly",
+              ...(versions[0].includes("nightly") && { path: "nightly" }),
             },
             ...(process.env.ENV === "dev" && {
               current: {

docs/docusaurus.config.js

@@ -70,7 +70,7 @@ const config = {
           lastVersion: versions[1],
           versions: {
             [versions[0]]: {
-              path: "nightly",
+              ...(versions[0].includes("nightly") && { path: "nightly" }),
             },
             ...(process.env.ENV === "dev" && {
               current: {