Improve Node.js description

[jjangga0214]

I added 'Asyncronous non-blocking event-driven' in front of the original description. I think they are core characteristics of Node.js, so this will more precisely depict what actually Node.js is, without loosing brevity. Also, these words are used on the first line of introduction on official Node.js website. What's more, by this update, someone who searches something like "async non-blocking framework" might find this repository.

By the way, I reviewed #1431 and #628.

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I REMOVED THE SECOND SECTION OF PR TEMPLATE FOR SAVING SCROLLING HEIGHT AS THIS PR IS FOR UPDATE