Merge fields focused demo

[andrzejkala]

Added:

• merge fields demo

Changed (added merge fields):

• feature-rich
• productivity-pack

[Witoso]

Demo feedback:

• Image is not loading for me, change to <img src="/assets/images/serenity-springs.png" alt="Serenity Springs Resort logo." />
• Then the image becomes to big, image resize: 35%, adding resize to the image toolbar may be needed. Or should we make the image wide so that it covers full width of the editor, just like emails usually do?
• I wonder if such a simple (but powerful) demo needs so many features. I would think about doing one line toolbar, and enabling a menu bar for more complex features. Removing: styles, media embed, code, rule, symbols, case change from the top of my head.
• I think I would put undo/redo first, then merge fields.
• The demo bleeds tons of warnings: merge-fields-provide-sanitize-function. We need to implement some dom-purify.
• Should we make it less wide to look more like an email editor?
• I was surprised that the content with which the editor opens is not a template, I would add it as well to templates.
• Pagination is not needed as well.
• I was a little thrown off that templates have different starting, sometimes it's Dear Name, and sometimes Title Last Name :D

Default template:

• Think about adding a block merge fields before a signature, or maybe a footer, added to all templates?
• Content is thin in the default template, I would add some AI generated text to make it more realistic. The picture on the top, should we style it, it just looks quite basic.
• URL merge field in the PS. for the unique discount link?

General demos:

1. We need to add some fonts, the content just looks worse if we don't have it. Lato same as the Builder could be the safest choice.
2. I do like the toolbars from the Builder more, links near basic styles, but this might be biased by my high usage. and I don't like how the toolbar breaks.

[usqr]

As an aside note we will probably create a PR later that will update the content & styles as we use a script to export those from the private demos repo.