💻 Reduce achievements time

[jpelay]

While working on another PR I found out that a new user that tries to create a class has to wait a lot of time for their first class to show. This happens because the showAchievements functions has some timeouts of 6 seconds, so the user, as a minimum has to wait this long if they get an achievement.

Therefore I reduced the time of the achievements a bit.

How to test

• Log in as teacher3
• Create a class
• The class shouldn't take ages to load

Other way to test:

• Log in as teacher1
• Duplicate a class
• The for teachers page should reload quickly

You can try that on main and see the difference (remember to clear the site data and restore the devdb in order for the achievement to be shown again)

[mergify]

Thank you for contributing! Your pull request is now going on the merge train (choo choo! Do not click update from main anymore, and be sure to allow changes to be pushed to your fork).