Added support for a newsletter (#2517)
In reference to idea:
https://github.com/alshedivat/al-folio/discussions/2097
In reference to request:
https://github.com/alshedivat/al-folio/issues/923#issuecomment-2171924663
Added support to integrate a [loops.so](https://loops.so/) mailing list
into the site.
To use, you need to enable `newsletter` in `_config.yml`. You also must
specify a loops endpoint (although I think any mailing list endpoint can
work), which you can get when you set up a mailing list on loops. More
documentation on loops: [here](https://loops.so/docs/forms/custom-form).
Once that is enabled, the behavior is different depending on how you
specified your footer to behave in `_config.yml`. If `footer_fixed:
true`, then the sign up will appear at the bottom of the about page, as
well as at the bottom of blog posts, if you enable `related_posts`.
If `footer_fixed: false`, then the newsletter signup will be in the
footer (on every page), like it is in on [my
website](https://asboyer.com).
I'm not attached to the placement of the signup, and you can choose to
include it wherever you want with `{% include scripts/newsletter.liquid
%}`. Also if you include positional variables into that, you can choose
how you center the signup. So `{% include scripts/newsletter.liquid
left=true %}` positions the signup bar to the left.
Here are some screenshots below:
## Dark version

## Light version

I think the input field color should probably change to maybe be light
for both themes? What do you think? I think the dark background looks
cool, but I don't usually see that done like that on other sites.
## Footer fixed


## Footer not fixed


To clarify, if footer isn't fixed, the email signup will appear on every
page.
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Co-authored-by: George <31376482+george-gca@users.noreply.github.com>