Eject works with yarn and npm

[fabienjuif]

Hi again,

I tried eject out of curiosity and it seems it didn't work with npm because @types/webpack was needed. So I added it.

Then I try with yarn (again, out of curiosity), and it didn't work for some reasons:

• awesome-typescript-loader was needed, so I added it
• I had to remove yarn.lock and node_modules as you did for pnpm

Finally, I rewamp the prompt message a little.

Feel free to discuss if you don't agree, and to rewrite from scratch if you don't want this code :)

[fabienjuif]

I made some other improvements base on your comment

[jvanbruegge]

Thanks