feat: Login and register forms style

[taorepoara]

Closes #388

Description of the changes

Add style to the login and register forms.

I've only implemented the client page since we need more OAuth features to work on back-office and app pages since we need to know which client is calling the page.

Checklist

• I didn't over-scope my PR
• My PR title matches the commit convention
• I did not include breaking changes
• I made my own code-review before requesting one

I included unit tests that cover my changes

• 👍 yes
• 🙅 no, because they aren't needed
• 🙋 no, because I need help

I added/updated the documentation about my changes

• 📜 README.md
• 📕 docs/*.md
• 📓 docs.lenra.io
• 🙅 no documentation needed

Technical highlight/advice

Since the password is managed by a different table than the user, we need to adapt the login password field make it work in both situations.

[jonas-martinez]

Just misses the little eye button to show the password during the register process. May be useful for the login too.

[jonas-martinez]

check above comment

[Nesqwik]

Some visual issues :

• The ">" is wrongly placed and incorrectly colored according to figma
  

• The form shift up/down entirely when switching from "login" to "register"
  

• when reducing the screen height, the scroll appear vertically AND horizontally instead of vertically only.
  

I've reproduced all of them in Arc Browser (Chrome-based) and Firefox.

[taorepoara]

* The ">" is wrongly placed and incorrectly colored according to figma
  ![Capture d’écran 2023-07-13 à 11 34 04](https://user-images.githubusercontent.com/6428498/253332573-d2cc6aa7-4dcb-4dbd-a6af-a44d7c6fc714.png)

I've resolved this issue in another branch. I let it like that.

* The form shift up/down entirely when switching from "login" to "register"
  ![Enregistrement de l’écran 2023-07-13 à 11 37 32](https://user-images.githubusercontent.com/6428498/253332832-9d51a6dd-3d79-4c09-9f0a-dc75867f7476.gif)

This is the wanted behavior: the content is vertically centered in the page as it is in Figma.

* when reducing the screen height, the scroll appear vertically **AND** horizontally instead of vertically only.
  ![Enregistrement de l’écran 2023-07-13 à 11 47 01](https://user-images.githubusercontent.com/6428498/253333649-ddb0b3eb-1096-4896-91b2-823037b26d71.gif)

I've reproduced all of them in Arc Browser (Chrome-based) and Firefox.

I could not reproduce this problem in Chrome nor Firefox. We'll check it again in the next branch.

[Nesqwik]

This is the wanted behavior: the content is vertically centered in the page as it is in Figma.

Well.. This should not IMO :(

I could not reproduce this problem in Chrome nor Firefox. We'll check it again in the next branch.

It probably depends of the screen size ? I have a small 13" screen

[taorepoara]

🎉 This PR is included in version 1.0.0 🎉

The release is available on:

• GitHub release
• v1.0.0

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