feat: Revert homepage changes, fix Persian slug 404, and make various article and about us adjustments

- Removed the newly added city-focused section from the homepage.
- Fixed 404 error for Persian slugs in specialties and blog pages by implementing a decode helper.
- Removed the "مخصوص شهر" label from article headers.
- Linked article tags to their respective filter pages.
- Adjusted related content images to prevent distortion.
- Added a section in the "About Us" page for physician registration guidance.
- Updated the logo in the "About Us" header to the correct version.
- Added tests for the new functionality and ensured existing tests are updated accordingly.

app/specialties/[slug]/page.js

@@ -10,6 +10,7 @@ import { buildSpecialtyFaq, buildSpecialtyIntro } from "@/lib/specialtyContent";
 import { isCategorySpecialty } from "@/lib/specialtyIndexing";
 import { safeJsonLd } from "@/lib/sanitize";
 import { fetchReq } from "@/lib/req";
+import { decodeRouteParam } from "@/lib/routeParams";
 import { isNextRedirectError } from "@/lib/maintenance";
 
 const API_URL = process.env.NEXT_PUBLIC_API_URL;
@@ -42,7 +43,8 @@ const getDoctors = cache(async (specialtyId, cityId) => {
 });
 
 export async function generateMetadata({ params }) {
-  const { slug } = await params;
+  const { slug: rawSlug } = await params;
+  const slug = decodeRouteParam(rawSlug);
   const specialty = findSpecialty(slug);
   if (!specialty) notFound();
 
@@ -73,7 +75,8 @@ export async function generateMetadata({ params }) {
 }
 
 async function SpecialtyDetail({ params }) {
-  const { slug } = await params;
+  const { slug: rawSlug } = await params;
+  const slug = decodeRouteParam(rawSlug);
   const specialty = findSpecialty(slug);
   if (!specialty) notFound();