Use sans-serif font everywhere

[adamzap]

This change was requested for simplicity and accessibility.

Closes #286.

[CuriousLearner]

Looks good! But I don’t see a finalized decision to standardize on a sans-serif: #286 is still open, and the 2022 switch to a system sans-serif was reverted (#1243). Are we standardizing on sans-serif now, or should we wait for a design decision?

[adamzap]

@CuriousLearner The website working group decided that the next step would be to open a PR like this. We'll see what others think (@sabderemane and @SaptakS especially since the three of us discussed it last month).

[SaptakS]

As discussed in the meeting, I think having a consistent font across both website and docs is nice. As pointed by @thibaudcolas in the issue, sans-serif are usually considered better from accessibility and readibility perspective. Also, given I see 2 approves from the Website WG members, I am inclined to approve and merge it.

I know most UI changes are not well accepted by a lot of users, but I feel this should go pretty smoothly (famous last words).

[SaptakS]

@CuriousLearner I think the revert that you mentioned was more related to using system fonts rather than san-serif fonts itself, if I read the PR correctly.