Add an index.md for the docs homepage

This is modelled after the index.rst.
It will only persist if the user chooses markdown as their preferred
filetype.

sp-files/index.md

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+# Starter pack
+
+**A single sentence that says what the product is, succinctly and memorably.**
+Consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et
+dolore magna aliqua.
+
+**A paragraph of one to three short sentences, that describe what the product
+does.** Urna cursus eget nunc scelerisque viverra mauris in. Nibh mauris
+cursus mattis molestie a iaculis at vestibulum rhoncus est pellentesque
+elit. Diam phasellus vestibulum lorem sed.
+
+**A third paragraph of similar length, this time explaining what need the
+product meets.** Dui ut ornare lectus sit amet est. Nunc sed augue lacus
+viverra vitae congue eu consequat ac libero id faucibus nisl tincidunt eget
+nullam.
+
+**Finally, a paragraph that describes whom the product is useful for.** Nunc
+non blandit massa enim nec dui nunc mattis enim. Ornare arcu odio ut sem
+nulla pharetra diam porttitor leo a diam sollicitudin tempor id eu. Ipsum
+dolor sit amet consectetur adipiscing elit pellentesque habitant.
+
+---------
+
+## In this documentation
+
+````{grid} 1 1 2 2
+
+```{grid-item-card} [Tutorials](index)
+
+**Start here**: a hands-on introduction to Example Product for new users
+```
+
+```{grid-item-card} [How-to guides](index)
+
+**Step-by-step guides** covering key operations and common tasks
+```
+
+````
+
+````{grid} 1 1 2 2
+:reverse:
+
+```{grid-item-card} [Reference](index)
+
+**Technical information** - specifications, APIs, architecture
+```
+
+```{grid-item-card} [Explanations](index)
+
+**Discussion and clarification** of key topics
+```
+
+````
+
+---------
+
+## Project and community
+
+Example Project is a member of the Ubuntu family. It’s an open source project that warmly welcomes community projects, contributions, suggestions, fixes and constructive feedback.
+
+* Code of conduct
+* Get support
+* Join our online chat
+* Contribute
+* Roadmap
+* Thinking about using Example Product for your next project? Get in touch!
+
+```{toctree}
+:hidden:
+:maxdepth: 2
+
+self
+```