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.

lib/routeParams.test.js

@@ -0,0 +1,29 @@
+import { describe, expect, it } from "vitest";
+import { decodeRouteParam } from "@/lib/routeParams";
+
+describe("decodeRouteParam", () => {
+  it("اسلاگ درصدی را به فارسی برمی‌گرداند", () => {
+    expect(
+      decodeRouteParam("%D8%AC%D8%B1%D8%A7%D8%AD-%DA%AF%D9%88%D8%A7%D8%B1%D8%B4")
+    ).toBe("جراح-گوارش");
+  });
+
+  it("فارسی خام دست‌نخورده می‌ماند", () => {
+    expect(decodeRouteParam("جراح-گوارش")).toBe("جراح-گوارش");
+  });
+
+  it("اسلاگ لاتین دست‌نخورده می‌ماند", () => {
+    expect(decodeRouteParam("gastroenterology")).toBe("gastroenterology");
+  });
+
+  it("درصد ناقص throw نمی‌کند و ورودی را برمی‌گرداند", () => {
+    // نتیجه‌اش باید ۴۰۴ طبیعی باشد، نه ۵۰۰.
+    expect(decodeRouteParam("%D8%")).toBe("%D8%");
+    expect(decodeRouteParam("100%-natural")).toBe("100%-natural");
+  });
+
+  it("ورودی غیر رشته‌ای همان‌طور برمی‌گردد", () => {
+    expect(decodeRouteParam(undefined)).toBeUndefined();
+    expect(decodeRouteParam(null)).toBeNull();
+  });
+});