feat: add html entities lab to full stack curriculum (#61716)

Co-authored-by: Kolade Chris <65571316+Ksound22@users.noreply.github.com>
Co-authored-by: Jessica Wilkins <67210629+jdwilkin4@users.noreply.github.com>

client/i18n/locales/english/intro.json

@@ -3397,6 +3397,12 @@
           "In this lab, you will design a sum all numbers algorithm. This algorithm takes an array of two numbers and returns the sum of those two numbers plus the sum of all the numbers between them."
         ]
       },
+      "lab-html-entitiy-converter": {
+        "title": "Implement an HTML Entity Converter",
+        "intro": [
+          "In this lab, you will convert special characters in a string to their corresponding HTML entities."
+        ]
+      },
       "review-javascript-fundamentals": {
         "title": "JavaScript Fundamentals Review",
         "intro": [

client/src/pages/learn/full-stack-developer/lab-html-entitiy-converter/index.md

@@ -0,0 +1,9 @@
+---
+title: Introduction to Implement an HTML Entity Converter
+block: lab-html-entitiy-converter
+superBlock: full-stack-developer
+---
+
+## Introduction to Implement an HTML Entity Converter
+
+In this lab, you will convert special characters in a string to their corresponding HTML entities.