feat: adding authentication page UI based on Figma

[sumit-158]

What

• Adding the login/register page UI design based on the Figma

Screenshot

Fixes bug(s)

• 7

  Part of

• https://github.com/openfoodfacts/community-portal/issues/2

[alexgarel]

@g123k can you review this, or ask someone knowing dart to review ?

For more context you can ask @sumit-158

[sumit-158]

@g123k I have updated the requested changes can you please check it , if its ok can you approve it else maybe give some more suggestions :)

[g123k]

@sumit-158 Could you share the Figma file please? Some paddings looks weird on your screenshot

[g123k]

Also please develop in a fork of this repo, not directly in it.

[sumit-158]

@sumit-158 Could you share the Figma file please? Some paddings looks weird on your screenshot

https://www.figma.com/file/AFo8ZYiNoom0o2Rakzg7vd/Community-portal-(OFF-version)?node-id=0%3A1

[g123k]

By simplify resizing the window, I have an Overflow: You should have a responsive design stating that if there is not enough space, the login form should go below the "Welcome" part