Add authentication & reactions

[jvnm-dev]

Added authentication & reactions

Documentation need to be updated to explain how to set this thing up (create a github app with write access on the blog repository, not OAuth app. And with homepage & callback = https://username.github.io/react-blog-github/)

Things to note:

• userClient should be used for request things as the current user
• Apollo GraphQL hooks are always done as the repository owner

Finally, it improves some things & delete unused files.

Extra note: I was forced to put https://username.github.io/react-blog-github/ as callback because github doesn't support # in urls

Working example: https://jvm-odoo.github.io/react-blog-github/#/

If you see any thing to improve do not hesitate to comment!

Related issue #26

[saadpasta]

@jvm-odoo Amazing Work 😀. I guess we should also update the readme.md with this that how can user create Github client secret and id and what should be the redirect url.

[jvnm-dev]

I will update the readme asap!