chore: update dependencies

[anikethsaha]

this PR contains

• update babel packages to @babel/*
• removed un-necessary babel plugin for spread operation of objects

No changes in source code and the site is working fine with no changes

[alexander-akait]

Please keep import as is

[anikethsaha]

getting this

while running in yarn start for es6 style webpack config.

I am using node 10

[montogeek]

Why is this change from npm to yarn necessary?

[anikethsaha]

The main docs site is using yarn as well. so I thought of keeping it consistent !
do you want this in npm ?

[EugeneHlushko]

Lets not, this is separate package with many differences from docs repo

[anikethsaha]

"@babel/register" was required as I think they moved out the register from the core

[anikethsaha]

cc @montogeek @evilebottnawi @EugeneHlushko Let me know if the current changes are fine.

[EugeneHlushko]

The new bundle is much bigger, i dont think its fine

[anikethsaha]

may be because of whatwg-fetch.