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.

components/aboutUs/Head.js

@@ -1,15 +1,11 @@
-import Image from "next/image";
 import React from "react";
+import SiteLogo from "@/components/common/SiteLogo";
 
-function Head({ siteName, slogan }) {
+function Head({ siteName, slogan, city }) {
   return (
     <div className="bg-[#5559C2] rounded-none md:rounded-lg w-full py-[24px] flex flex-col items-center justify-center gap-[13px] md:gap-[16px]">
-      <Image
-        src="/assets/images/logo-2.png"
-        height={46}
-        width={46}
-        alt="logo"
-      />
+      {/* رنگ پیش‌فرض لوگو #5559CE است و روی همین پس‌زمینه گم می‌شود؛ نسخهٔ روشن. */}
+      <SiteLogo city={city} stroke="#FAFAFA" className="w-[46px] h-[46px]" />
       <h1 className="text-[#FAFAFA] text-[16px] sm:text-[18px] md:text-[22px] lg:text-[24px] font-bold">
         درباره {siteName}
       </h1>