Adding support for home pages that immediately redirect to other sites.

[gvwilson]

Some sites would like to use their own home pages for workshops rather than GitHub pages. However, all of our website machinery expects to harvest workshop information from GitHub. The (hacked) solution is to allow people to create a GitHub repository containing a home page that immediately redirects to their own site. To do this, we:

1. Create a new layout called redirect.html containing a YAML header key redirect.
2. Tell them to mv redirect-index.html index.html and then edit the header.
3. Modify the bin/swc_index_validator.py script to take a -r flag, and then check for redirection if that flag is present.

I'm sure a cleaner implementation of all of this is possible...

[gvwilson]

@jduckles @r-gaia-cs @philippbayer Please have a look.

[rgaiacs]

I'm sure a cleaner implementation of all of this is possible...

What about add

<meta http-equiv="refresh" content="0; url={{page.redirect}}" />

into _layouts/bootcamp.html as

{% if page.redirect %}
<meta http-equiv="refresh" content="0; url={{page.redirect}}" />
{% endif %}

[philippbayer]

+1 @r-gaia-cs, that's how I did it with the pycon AU redirect page

[rgaiacs]

I'm closing this in favor of #764.