submissions analysis and rendering pages

[celine-lee]

run

python docs/render_submissions.py --do_setup --get_blank_details --get_reference_details --analyze_submissions --render_webpages

to generate everything. whenever we want to run submissions analysis,

python docs/render_submissions.py --analyze_submissions --render_webpages

will pull from celinelee/commit0_submissions (that should be un-hard-coded later) all submissions to do analysis on, then automatically render markdown pages.
once markdown pages are rendered, push to site

cd commit-0.github.io
mkdocs gh-deploy --config-file $PATH_TO_COMMIT0/mkdocs.yml --remote-branch main