[WEB-4098] feat: noindex/nofollow (#7088)

* feat: noindex/nofollow

- On login: nofollow
- On app pages: noindex, nofollow

https://app.plane.so/plane/browse/WEB-4098/

- https://nextjs.org/docs/app/api-reference/file-conventions/layout
- https://nextjs.org/docs/app/building-your-application/routing/route-groups#creating-multiple-root-layouts
- https://nextjs.org/docs/app/api-reference/functions/generate-metadata#link-relpreload

* chore: address PR feedback

web/app/(all)/[workspaceSlug]/(projects)/header.tsx

@@ -0,0 +1,64 @@
+"use client";
+
+import Image from "next/image";
+import { useTheme } from "next-themes";
+import { Home } from "lucide-react";
+// images
+import githubBlackImage from "/public/logos/github-black.png";
+import githubWhiteImage from "/public/logos/github-white.png";
+// ui
+import { GITHUB_REDIRECTED } from "@plane/constants";
+import { useTranslation } from "@plane/i18n";
+import { Breadcrumbs, Header } from "@plane/ui";
+// components
+import { BreadcrumbLink } from "@/components/common";
+// constants
+// hooks
+import { useEventTracker } from "@/hooks/store";
+
+export const WorkspaceDashboardHeader = () => {
+  // hooks
+  const { captureEvent } = useEventTracker();
+  const { resolvedTheme } = useTheme();
+  const { t } = useTranslation();
+
+  return (
+    <>
+      <Header>
+        <Header.LeftItem>
+          <div>
+            <Breadcrumbs>
+              <Breadcrumbs.BreadcrumbItem
+                type="text"
+                link={
+                  <BreadcrumbLink label={t("home.title")} icon={<Home className="h-4 w-4 text-custom-text-300" />} />
+                }
+              />
+            </Breadcrumbs>
+          </div>
+        </Header.LeftItem>
+        <Header.RightItem>
+          <a
+            onClick={() =>
+              captureEvent(GITHUB_REDIRECTED, {
+                element: "navbar",
+              })
+            }
+            className="flex flex-shrink-0 items-center gap-1.5 rounded bg-custom-background-80 px-3 py-1.5"
+            href="https://github.com/makeplane/plane"
+            target="_blank"
+            rel="noopener noreferrer"
+          >
+            <Image
+              src={resolvedTheme === "dark" ? githubWhiteImage : githubBlackImage}
+              height={16}
+              width={16}
+              alt="GitHub Logo"
+            />
+            <span className="hidden text-xs font-medium sm:hidden md:block">{t("home.star_us_on_github")}</span>
+          </a>
+        </Header.RightItem>
+      </Header>
+    </>
+  );
+};