Feature Request: Include a roadmap of the topics to study

[caramelmelmel]

Problem:
Found that going through the priority levels of topics to study for technical interviews to be quite hard in learning.

Proposal:
Instead of segregating the topics out one by one, we should see how one topic is linked to the other via systematic studying. For example, linkedlist related to graphs. Thought of including the meta and google style of suggested interview prep inside this via a roadmap like that of Neetcode but this roadmap will use color coding to highlight the high, medium and low priority topics here in the handbook.

I have also picked out from grind75 some of the important to do questions for each topic to help beginners streamline their studying here.