Refactoring all functions which deal with getting data from adjacent child nodes

[akshayraichur]

Currently, to fetch the data from sibling nodes, I do it as event.target.previousElementSibling to get the data of say card description of the card title.
But this is completely inefficient and also not reliable. If in the future we decide to add a few more fields, that time this would fail terribly.
To avoid this, we can make it more dynamic by getting the element from className and then updating.