chore: update roadmap content json (#8829)

Co-authored-by: kamranahmedse <4921183+kamranahmedse@users.noreply.github.com>

public/roadmap-content/backend.json

@@ -133,11 +133,6 @@
         "url": "https://php.net/",
         "type": "article"
       },
-      {
-        "title": "Learn PHP - W3Schools",
-        "url": "https://www.w3schools.com/php/",
-        "type": "article"
-      },
       {
         "title": "PHP - The Right Way",
         "url": "https://phptherightway.com/",
@@ -236,11 +231,6 @@
         "url": "https://www.java.com/",
         "type": "article"
       },
-      {
-        "title": "W3 Schools Tutorials",
-        "url": "https://www.w3schools.com/java/",
-        "type": "article"
-      },
       {
         "title": "Explore top posts about Java",
         "url": "https://app.daily.dev/tags/java?ref=roadmapsh",
@@ -303,11 +293,6 @@
         "url": "https://learn.microsoft.com/en-us/dotnet/csharp/tour-of-csharp/",
         "type": "article"
       },
-      {
-        "title": "C# on W3 schools",
-        "url": "https://www.w3schools.com/cs/index.php",
-        "type": "article"
-      },
       {
         "title": "Explore top posts about C#",
         "url": "https://app.daily.dev/tags/csharp?ref=roadmapsh",
@@ -613,11 +598,6 @@
         "url": "https://www.mysql.com/",
         "type": "article"
       },
-      {
-        "title": "W3Schools - MySQL Tutorial",
-        "url": "https://www.w3schools.com/mySQl/default.asp",
-        "type": "article"
-      },
       {
         "title": "MySQL for Developers",
         "url": "https://planetscale.com/courses/mysql-for-developers/introduction/course-introduction",
@@ -1089,11 +1069,6 @@
     "title": "SOAP",
     "description": "Simple Object Access Protocol (SOAP) is a message protocol for exchanging information between systems and applications. When it comes to application programming interfaces (APIs), a SOAP API is developed in a more structured and formalized way. SOAP messages can be carried over a variety of lower-level protocols, including the web-related Hypertext Transfer Protocol (HTTP).\n\nVisit the following resources to learn more:",
     "links": [
-      {
-        "title": "w3school SOAP explanation",
-        "url": "https://www.w3schools.com/xml/xml_soap.asp",
-        "type": "article"
-      },
       {
         "title": "REST vs SOAP",
         "url": "https://www.youtube.com/watch?v=_fq8Ye8kodA",