fix: map progress ui

[ahmaxed]

Checklist:

• [x] I have read freeCodeCamp's contribution guidelines.
• [x] My pull request has a descriptive title (not a vague title like Update index.md)
• [x] My pull request targets the main branch of freeCodeCamp.
• [x] I have tested these changes either locally on my machine, or GitPod.

[ahmaxed]

We can definitely pair on it. I agree, the items outside of the curriculum set should not have numbers or arrows.

[ahmaxed]

[Sembauke]

The arrows seem no longer centred.

[moT01]

I added some logic to see if the user has completed all the challenges in a superblock - if so, the icon with the double circle shows up:

^ 1: none 2: isCert 3: isCert & allChallengesCompleted 4: same as 2 5: allChallengesCompleted

[moT01]

Not sure if we want this, but I made the arrows a little thicker too:

Let me know if I should revert

[ahmaxed]

Tom's changes are LGMT.