Add default configs as props of Notifications component (fix #24)

[Ennoriel]

Hello there,

I added the default config as props of Notifications component. I'd like to know if the implementation is okay with you and I can document it then. I fixed the 0 timeout still showing a notification. It now takes the default removeAfter value. I updated the example to be able to unselect a direction value.

The cypress tests are currently failing because of the new ability to unselect a position in the example. We can fix that by either:

• unset the default position
• unselect the default position in the beforeEach method

[Ennoriel]

Hello @usernamus , sorry to ping you 😜 Would you be willing to review the PR or maybe you know other maintainers? About the cyperss test, which option do you prefer that I could implement?

[usernamus]

@Ennoriel I'll take a look at this over the weekend

[LeGmask]

Any updates ?