Add COVID policy to website

[mrmundt]

Description

We have implemented a mask mandate. This PR adds the information to the website.

Checklist:

• (Committee Chairs Only) I have posted the link for the PR in the usrse slack (#usrse-2023-conference-planning-committee) to ask for content reviewers
• I have previewed changes locally
• I have updated the README.md if necessary

cc @mrmundt @cabejackson @manning-ncsa @jmelot @jbteves-sandia @jsubida

[mrmundt]

Preview: https://output.circle-artifacts.com/output/job/9acdc117-1a0f-479b-9469-07f20bdcf761/artifacts/0/usrse.github.io/usrse23/attend/index.html

[sstevens2]

Should we have a person to contact with questions or to confirm exception?

[jdamerow]

I think that makes sense! Maybe we add "If you have questions, please contact the organizers at usrsecon2023@easychair.org."?

[lbianchi-lbl]

(I think this is perfectly fine as-is; just using "Request changes" to prevent it from merging automatically, so feel free to dismiss my review to get around that)

I'm thinking whether it would make sense to create a dedicated page (so that it shows up at e.g. https://us-rse.org/usrse23/attend/covid or even https://us-rse.org/usrse23/attend/health, and then link to it from the post and /attend page. The main reason for the dedicated page would be to make it easier to link to (e.g. in communications, as QR codes in the venue, etc).

[cferenba]

I think that makes sense! Maybe we add "If you have questions, please contact the organizers at usrsecon2023@easychair.org."?

I'd suggest using a usrse.org address rather than an easychair one. Otherwise this sounds like a good idea.

[jdamerow]

I don't think we have one for the conference. This address is the one currently on the website. But I might be wrong.

[mrmundt]

All, I added a unique page (still left it on the main attend page so there is lesser chance of it being missed). I also added the email as a link.

[mrmundt]

Preview: https://output.circle-artifacts.com/output/job/9acdbc71-79f0-47d4-b019-8682bc3ee543/artifacts/0/usrse.github.io/usrse23/attend/health/index.html