[4.0] Remove Fade effect

[brianteeman]

Summary of Changes

Faster login

Removes the delay which is counter-logic

Solves stutter bug #25904

#25904 (comment)

Solves internet explorer bug #26005

(of course it wont work nicely with IE but at least someone could now log in if they have an emergency AND it opens the possibility to add a "does not work with IE" message" which you can't before this PR

Testing Instructions

Apply PR and then run npm i

Check that login works
It should now be faster and smoother

Bonus try and open the admin with ie11

(First of several PR on atum)

[jwaisner]

I have tested this item ✅ successfully on 2e3b4ee

Login page no longer fades on login. Confirmed clean install is successful. Login is faster.

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[Quy]

Please don't delete _mixin.scss and @import so the same mixin code for LTR/RTL can be implemented for the backend. Thanks.

[brianteeman]

But it's not being used after this pr

[Quy]

Yes, but I want to add the LTR/RTL mixin from #27861 to _mixin.scss in Atum. Leave the file blank instead of deleting it please so I don't need to recreate it in my PR to come later.

[brianteeman]

Ok. Will do in the morning

[brianteeman]

@Quy done as requested

[Quy]

I have tested this item ✅ successfully on b932cb1

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[Quy]

RTC

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[richard67]

Tested with success, too. Will merge.

[richard67]

Thanks. Btw. my nick name for my German friends is "Fade", so I first was confusde about the title ;-)

[Quy]

@brianteeman Close #25904?

[brianteeman]

@Quy you requested that this empty mixin file was not removed as you had a PR that would be using it
its nine months later and the empty file is still there. did you forget your pr or was it done a different way.

In other words we should remove this empty file and references to it

[Quy]

Thanks for the reminder. Removed in PR #31210.