Fix content resource headings in js roadmap (#2616)

* Adding information on QA SDLC Delivery Model node

* Update content/roadmaps/113-qa/content/101-qa-sdlc/readme.md

* Tweaking files in the Chrome Dev Tools section - JS roadmap

* Tweaking format on files from Memory Management - JS roadmap

* Fixed issue with one of the Free Contents - CommonJS readme

* Format tweak on Callback nodes - JS Roadmap

* Format tweaks on different files from the Expressions and Operators tree

Co-authored-by: Kamran Ahmed <kamranahmed.se@gmail.com>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/102-arithmetic-operators.md

@@ -12,6 +12,7 @@ Arithmetic operators in JavaScript are as follows:
 - `++` (Increment)
 - `--` (Decrement)
 
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators#arithmetic_operators'>Arithmetic Operators - MDN</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://javascript.info/operators#maths'>Arithmetic Operators - JavaScript.info</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://www.w3schools.com/js/js_arithmetic.asp'>JavaScript Arithmetic Operators</BadgeLink>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/103-bitwise-operators.md

@@ -13,5 +13,6 @@ Bitwise operators in JavaScript are as follows:
 - `>>` (Right SHIFT)
 - `>>>` (Zero-Fill Right SHIFT)
 
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#bitwise_operators'>Bitwise Operators - MDN</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://javascript.info/operators#bitwise-operators'>Bitwise Operators - JavaScript.info</BadgeLink>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/104-logical-operators.md

@@ -2,5 +2,6 @@
 
 There are four logical operators in JavaScript: `||` (OR), `&&` (AND), `!` (NOT), `??` (Nullish Coalescing).
 
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators#binary_logical_operators'>Logical Operators - MDN</BadgeLink>
 <BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators#binary_logical_operators'>Logical Operators - MDN</BadgeLink>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/105-bigint-operators.md

@@ -2,4 +2,5 @@
 
 Most operators that can be used with the `Number` data type will also work with `BigInt` values (e.g. arithmetic, comparison, etc.). However, the unsigned right shift `>>>` operator is an exception and is not supported. Similarly, some operators may have slight differences in behaviour (for example, division with `BigInt` will round towards zero). 
 
-<BadgeLink colorScheme='blue' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#bigint_operators'>BigInt Operators</BadgeLink>
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators#bigint_operators'>BigInt Operators</BadgeLink>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/109-unary-operators.md

@@ -2,5 +2,6 @@
 
 JavaScript Unary Operators are the special operators that consider a single operand and perform all the types of operations on that single operand. These operators include unary plus, unary minus, prefix increments, postfix increments, prefix decrements, and postfix decrements.
 
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink colorScheme="yellow" badgeText="Read" href="https://www.educba.com/unary-operators-in-javascript/">Unary Operators in JavaScript</BadgeLink>
 <BadgeLink colorScheme="yellow" badgeText="Read" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators#unary_operators">Unary Operators - MDN</BadgeLink>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/110-relational-operators.md

@@ -2,4 +2,5 @@
 
 Relational operators are also known as comparison operators. They are used to find the relationship between two values or compare the relationship between them; on the comparison, they yield the result true or false.
 
+<ResourceGroupTitle>Free Content</ResourceGroupTitle>
 <BadgeLink colorScheme="yellow" badgeText="Read" href="https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Operators#relational_operators">Relational Operators - MDN</BadgeLink>

content/roadmaps/106-javascript/content/108-javascript-expressions-and-operators/readme.md

@@ -3,4 +3,4 @@
 At a high level, an expression is a valid unit of code that resolves to a value. There are two types of expressions: those that have side effects (such as assigning values) and those that purely evaluate. The expression `x = 7` is an example of the first type. This expression uses the `=` operator to assign the value seven to the variable x. The expression itself evaluates to 7. The expression `3 + 4` is an example of the second type. This expression uses the `+` operator to add `3` and `4` together and produces a value, `7`. However, if it's not eventually part of a bigger construct (for example, a variable declaration like const `z = 3 + 4`), its result will be immediately discarded `—` this is usually a programmer mistake because the evaluation doesn't produce any effects. As the examples above also illustrate, all complex expressions are joined by operators, such as `=` and `+`.
 
 <ResourceGroupTitle>Free Content</ResourceGroupTitle>
-<BadgeLink colorScheme='blue' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators'>Expressions and operators</BadgeLink>
+<BadgeLink colorScheme='yellow' badgeText='Read' href='https://developer.mozilla.org/en-US/docs/Web/JavaScript/Guide/Expressions_and_Operators'>Expressions and operators</BadgeLink>