feat: redirect /cxl-sso to https://cxl.com/institute/oauth/authorize

[anoblet]

https://app.clickup.com/t/86b2gjwmu

Description

This PR solves # .

Steps completed:

According to our definition of done, I have completed the following steps:

• Acceptance criteria met
• Unit tests added
• Docs updated (including config and env variables)
• Translations added
• UX tested
• Browsers / platforms tested
• Rebased & ready to merge without conflicts
• Reviewed own code

[anoblet]

It's not very elegant, though doing it elsewhere in the app would take a long time to load.

Edit:
I tried Firebase rewrite, Vite server proxy, and React Router Dom, none of which supported an external redirect with params without eventually using this code.

[pawelkmpt]

We have misunderstanding here :( It was not suppose to just redirect URL but get all params generated by getOAuthConfig and then redirect.

I didn't write explicitly to use this function (?) in the ClickUp description but thought "all necessary params" and "same kind of redirect" explain my goal.

[pawelkmpt]

See #12