Fix/copy improvements (#16859)

* fix(seed): Simplify copy of lessons and remove need for image

* rework copy for account creation and login emails

* fix: Fixup email template and lock-file

challenges/02-javascript-algorithms-and-data-structures/functional-programming.json

@@ -9,8 +9,8 @@
         "title": "Introduction to the Functional Programming Challenges",
         "description": [
           [
-            "http://imgs.xkcd.com/comics/functional.png",
-            "XKCD web comic with one person asking why the other likes functional programming so much, and the second responding that tail recursion is its own reward.",
+            "",
+            "",
             "Functional programming is an approach to software development based around the evaluation of functions. Like mathematics, functions in programming map input to output to produce a result. You can combine basic functions in many ways to build more and more complex programs.<br><br>Functional programming follows a few core principles:<br><br><ul><li>Functions are independent from the state of the program or global variables. They only depend on the arguments passed into them to make a calculation</li><br><li>Functions try to limit any changes to the state of the program and avoid changes to the global objects holding data</li><br><li>Functions have minimal side effects in the program</li></ul><br><br>The functional programming software development approach breaks a program into small, testable parts. This section covers basic functional programming principles in JavaScript.",
             ""
           ]        ],