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Add demo and improve docs (#4)

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Wagtail has support for adding numerous types of links to `RichTextBlock` content, but there is not a way to tie a link to an arbitrary `snippet` model currently. `wagtail-draftail-snippet` provides a way to add a new button to the Draftail rich text editor, which creates an `a href` element for a specific `snippet` model based on a template that can be provided.
![Demo of wagtail-draftail-snippet plugin](https://i.imgur.com/pyX25hg.gif)
## Install
1. `pip install wagtail-draftail-snippet`
1. Add `wagtail_draftail_snippet` to `INSTALLED_APPS` in Django settings
1. Add `"snippet"` to the `features` keyword list argument when instantiating a `RichTextBlock`, e.g. `paragraph = RichTextBlock(features=["bold", "italic", "h1", "h2", "h3", "snippet"])`
1. Create a frontend template to determine how the snippet model will be rendered. Frontend templates are required for a snippet to be selected and are discovered when they match a path like `{app_name}/{model_name}_snippet.html`. For example, if you have an `Affiliate` snippet model in `affiliates/models.py`, then a file in `affiliates/templates/affiliates/affiliate_snippet.html` would be required.