Add possibility to write text with a markdown "about" file on the title page

[davidkroell]

This adds the option (behind a feature-flag) to write more text onto the home page.

I had to change the source branch and the other PR #170 was unfortunately automatically closed.

Superceeds #170

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[davidkroell]

@yashmehrotra I had to create another PR, which is essentially the same as #170.

Do we need this 3rd type ? Since its only for the homepage, can we just infer it via filename and its existense ?

Yea probably, but I'm fairly new to Hugo, so I don't know how. If you can provide a path for me, I can implement it.

[yashmehrotra]

Yea probably, but I'm fairly new to Hugo, so I don't know how. If you can provide a path for me, I can implement it.

Since the only place to add about is the index page, the path of the about file can be static. (For eg., content/index-about.md)

Our logic then will be:

• Check if that file exists
• If yes, include partial else ignore

[davidkroell]

@yashmehrotra I made the necessary changes, and the new version is far more straightforward.

[yashmehrotra]

Thanks for the PR @davidkroell