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_028/sol1.py

@@ -0,0 +1,58 @@
+"""
+Problem 28
+Url: https://projecteuler.net/problem=28
+Statement:
+Starting with the number 1 and moving to the right in a clockwise direction a 5
+by 5 spiral is formed as follows:
+
+    21 22 23 24 25
+    20  7  8  9 10
+    19  6  1  2 11
+    18  5  4  3 12
+    17 16 15 14 13
+
+It can be verified that the sum of the numbers on the diagonals is 101.
+
+What is the sum of the numbers on the diagonals in a 1001 by 1001 spiral formed
+in the same way?
+"""
+
+from math import ceil
+
+
+def solution(n: int = 1001) -> int:
+    """Returns the sum of the numbers on the diagonals in a n by n spiral
+    formed in the same way.
+
+    >>> solution(1001)
+    669171001
+    >>> solution(500)
+    82959497
+    >>> solution(100)
+    651897
+    >>> solution(50)
+    79697
+    >>> solution(10)
+    537
+    """
+    total = 1
+
+    for i in range(1, int(ceil(n / 2.0))):
+        odd = 2 * i + 1
+        even = 2 * i
+        total = total + 4 * odd ** 2 - 6 * even
+
+    return total
+
+
+if __name__ == "__main__":
+    import sys
+
+    if len(sys.argv) == 1:
+        print(solution())
+    else:
+        try:
+            n = int(sys.argv[1])
+            print(solution(n))
+        except ValueError:
+            print("Invalid entry - please enter a number")