Feature/ Content: Common Content mass front matter change

[SallyMcGrath]

What does this change?

1. Change all instances of headless=true in blocks front matter to

[build]
    render = false
    list = 'local'
    publishResources = false

https://gohugo.io/content-management/build-options/

2. Add an index file to each folder, so these can show on common-docs block viewer

Common Content?

Yes ALL blocks in common content

This is part 2 of 3 linked PRS

#844 <== common-theme changes
#845 <== common-content changes
#846 <== common-docs site created

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[illicitonion]

It feels like there are two useful tests we could automate here:

1. Pages which should have the [build] section you've inserted have it
2. ?Every directory has an index of some description

Once I address #696 and get it merged, I'd be very happy to either write these checks, or pair with you to do so; can we try to enumerate the conditions where each is expected/required?

[SallyMcGrath]

It feels like there are two useful tests we could automate here:

1. Pages which should have the [build] section you've inserted have it
2. ?Every directory has an index of some description

Once I address #696 and get it merged, I'd be very happy to either write these checks, or pair with you to do so; can we try to enumerate the conditions where each is expected/required?

Yes to this - yes please!

I just feel exhausted at the idea of updating these files (i'm no good at regex) so I might need to work up the energy for it first