BUG: Edit on Github goes to 404 for transcluded pages

[corneliusroemer]

When clicking the Edit on Github button at the top right on the beast guide page: https://docs.nextstrain.org/en/latest/guides/bioinformatics/import-beast.html, one ends up with a 404 Github error: https://github.com/nextstrain/docs.nextstrain.org/blob/master/src/guides/bioinformatics/import-beast.md

The page actually lives here: https://github.com/nextstrain/augur/blob/f4e46fba552297577dcbbc0bd3644639452a1591/docs/faq/import-beast.md?plain=1#L1

There are probably a few other doc pages with the same bug, possibly all those here:

docs.nextstrain.org/src/fetch-docs.py

Lines 13 to 24 in e79ead4

	docs = {
	f'{auspice_url}narratives/create-pdf.md': 'guides/communicate/create-pdf.md',
	f'{auspice_url}narratives/introduction.md': 'guides/communicate/narratives-intro.md',
	f'{augur_url}usage/augur_snakemake.md': 'guides/bioinformatics/augur_snakemake.md',
	f'{augur_url}faq/translate_ref.md': 'guides/bioinformatics/translate_ref.md',
	f'{augur_url}faq/import-beast.md': 'guides/bioinformatics/import-beast.md',
	f'{augur_url}faq/colors.md': 'guides/bioinformatics/colors.md',
	f'{augur_url}faq/lat_longs.md': 'guides/bioinformatics/lat_longs.md',
	f'{augur_url}faq/vcf_input.md': 'guides/bioinformatics/vcf_input.md',
	f'{augur_url}faq/fasta_input.md': 'guides/bioinformatics/fasta_input.md',
	f'{augur_url}faq/seq_traits.md': 'guides/bioinformatics/seq_traits.md',
	f'{augur_url}examples/examples.rst': 'guides/bioinformatics/examples.rst',

[victorlin]

I'm not sure if there is an easy fix here since the docs fetching is inherently hacky. The proper solution would be to replace that implementation: #200