simplify website to one page and add new space info

[alifeee]

current site has:

• the calendar duplicated 3 times
• annoying to navigate between pages which don't have that much content individually
• outdated pictures of the space

this PR:

• make the site a single page with headings (instead of multiple pages)
• add a few images to make access easier

see preview: https://shhm-singlepage.surge.sh/

main update is this

and then this new image

and this replacement of the "the space" section

still to-do (in a separate PR) is to put some pictures of the space on the site (probably take a few new ones) — maybe using the same photosphere as the blog post

[alifeee]

this is probably worthless with the single page

the two links can be put individually in the header, and the social media/etc in the footer