Fix YouTube video preview images

Author: tboychuk

1-0-java-basics/1-3-0-hello-generics/README.MD

@@ -24,7 +24,6 @@ it is not safe. Using `Object` requires runtime casting which can cause runtime
 
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 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/Q5aEmF8E86fbZ4rXA)
 
 ##
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1-0-java-basics/1-3-2-heterogeneous-max-holder/README.MD

@@ -9,9 +9,11 @@
 * implement a generic method getMax that retrieves a max value by its type ✅
 * wrap a comparator instance to make it null-safe ✅
 
+### Exercise overview 🇺🇦
+[![Watch the video](https://img.youtube.com/vi/jQnGDgH-Zfg/0.jpg)](https://www.youtube.com/watch?v=jQnGDgH-Zfg)
+
 ---
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/u6kHcecFuzxV232LA)
 
 ##
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2-0-data-structures-and-algorithms/2-2-5-array-list/README.MD

@@ -22,7 +22,6 @@ Build strong skills implementing a well known Array List data structure 💪
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 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/WQPxc7rDFgZK6eEk7)
 
 ##
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3-0-java-core/3-6-1-file-reader/README.MD

@@ -12,7 +12,6 @@ You're supposed to know the basics of Stream API and how to work with files in J
 
 ---
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/MAfCxL1JLfY76ki9A)
 
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3-0-java-core/3-6-2-file-stats/README.MD

@@ -15,7 +15,6 @@ You're supposed to know how to work with text files and be able to write Java co
 ---
 
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/jhXEAzG4TB81S43CA)
 
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3-0-java-core/3-6-3-crazy-regex/README.MD

@@ -61,7 +61,6 @@ it's called back reference)
 ---
 
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/jhXEAzG4TB81S43CA)
 
 ##
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3-0-java-core/3-6-4-random-field-comparator/README.MD

@@ -11,7 +11,6 @@
 
 ---
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/u6kHcecFuzxV232LA)
 
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4-0-object-oriented-programming/4-3-1-flight-search/README.MD

@@ -21,7 +21,6 @@ You're supposed to be familiar polymorphism and Java interfaces
 ---
 
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/8YUNC2YctwDi7qwP7)
 
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5-0-functional-programming/5-0-1-lambda-functions-map/README.MD

@@ -13,7 +13,6 @@ Start learning functional programming in Java by writing simple math functions u
 ---
 
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/TPSCpZAMZvNXYCoA6)
 
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5-0-functional-programming/5-0-2-stream-sum-of-squares/README.MD

@@ -9,7 +9,6 @@ Learn functional programming by refactoring a piece of code using Stream API 
 
 ---
 #### 🆕 First time here? – [See Introduction](https://github.com/bobocode-projects/java-fundamentals-exercises/tree/main/0-0-intro#introduction)
-#### ➡️ Have any feedback? – [Please fill the form ](https://forms.gle/7GaNdgTDWhaSh4fc7)
 
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