Say "WASI 0.2" instead of "WASI Preview 2".

[sunfishcode]

No description provided.

[disquisitioner]

Can we adjust the beginning of the post so there's more of an excerpt that can be pulled out and shown on the overall "News' page on our site? As it stands now Jekyll is attempting to automatically extract that excerpt and is confused by the "Original post..." line that is the first one in the article. This yields an entry on the News page that looks like this:

I'd suggested a modification on @ricochet's initial PR that used the 'excerpt_separator' syntax to fine tune what gets generated. Something like:

 ---
title: WASI 0.2 Launched
author: "Dan Gohman"
github_name: sunfishcode
excerpt_separator: <!--end_excerpt-->
---
The WASI Subgroup voted on January 25, 2024 to launch WASI 0.2, also known 
as WASI Preview 2, or WASIp2!  This blog post is a brief look at the present, past, and future of WASI,
and a repost of an original article shared
[here]( https://blog.sunfishcode.online/wasi-0-2/).
<!--end_excerpt-->

## The present

Alternative wording is fine but this yields a more helpful excerpt for our News page.

[sunfishcode]

Sounds good. I've now updated the intro paragraph.

[disquisitioner]

Looks great, thanks! I think we're good to go, and will approve this PR and merge with the site. Appreciate the diligence in dialing in the wording with WASI 0.2 and coordinating with a whole bunch of folks in the process.