Part 4 - ordering of sections

[connor-haley]

Currently the ordering is:
functions > for loops > if-else statements > functions again

Proposed new order:
if-else statements > for loops > functions

Notes:
if statements are very intuitive and many have used them in programs like Excel, then for loops are super important and second-most intuitive, then functions can combine all this together

[pssachdeva]

Closed by #59.