Update index.md

[annajiat]

Current template forces to choose between address or online.
Added a comment to accommodate 'hybrid' for workshops being simultaneously held in-person and online

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[zkamvar]

Thank you for this PR @annajiat. There are a couple of things that need to happen before we merge this and make this a reality:

1. The source code for the carpentries website needs to be modified to include a hybrid symbol (a la the online symbol as a globe that we currently have)
2. hybrid needs to be included as a condition in

   workshop-template/index.md

   Line 149 in 082c084

   {% if page.address == "online" %}

   and

   workshop-template/_includes/workshop_ad.html

   Line 6 in 082c084

   {% if page.address == "online" %}

   to display the information properly (note the latter is really a fix for styles)

Would you like me to take care of those?