Page now returns to correct scroll Position

[idontknowjs]

Fixes #374
Issue was: While visiting any sub heading like this, the scroll position was not correct

Changes:

1. Tried various methods like checking when DOM is ready with: document.readyState === "complete"
2. Tried adding defer in <script src="./js/init.js"></script>.
3. Also with document.querySelector(target).offsetTop, document.querySelector(target) showed null because DOM was not loaded till that time. Like shown below

But the above steps were not working as it's expected.
So it only worked by adding a setTimeout() function

Also thanks to @ffd8, for the suggestions

[idontknowjs]

@limzykenneth @lmccart can you please review it