Rename Project Euler directories and other dependent changes (#3300)

* Rename all Project Euler directories:

Reason:
The change was done to maintain consistency throughout the directory
and to keep all directories in sorted order.

Due to the above change, some config files had to be modified:
'problem_22` -> `problem_022`

* Update scripts to pad zeroes in PE directories

project_euler/problem_013/sol1.py

@@ -0,0 +1,25 @@
+"""
+Problem 13: https://projecteuler.net/problem=13
+
+Problem Statement:
+Work out the first ten digits of the sum of the following one-hundred 50-digit
+numbers.
+"""
+import os
+
+
+def solution():
+    """
+    Returns the first ten digits of the sum of the array elements
+    from the file num.txt
+
+    >>> solution()
+    '5537376230'
+    """
+    file_path = os.path.join(os.path.dirname(__file__), "num.txt")
+    with open(file_path, "r") as file_hand:
+        return str(sum([int(line) for line in file_hand]))[:10]
+
+
+if __name__ == "__main__":
+    print(solution())