This updates all current documentation of Composition Functions in the
master directory to reflect the new v1beta1 implementation.

Signed-off-by: Nic Cope <nicc@rk0n.org>

Signed-off-by: Nic Cope <nicc@rk0n.org>

I plan to use the same page to document how to write a composition
function. I'll add that documenation in a future commit.

Signed-off-by: Nic Cope <nicc@rk0n.org>

Per instructions from Hugo:
https://gohugo.io/content-management/diagrams/#mermaid-diagrams

The styling could probably be updated to be more in line with the rest
of the docs, but this already looks better to me than the goat ASCII
diagrams Hugo supports out of the box.

Signed-off-by: Nic Cope <nicc@rk0n.org>

This consists of two sections in the existing page:

* How to write a function
* How functions work

The former is somewhat light, because I intend to add detailed guides
for each language we support. It's hard to go too deep in this general
documentation without using language-specific examples.

Signed-off-by: Nic Cope <nicc@rk0n.org>

Signed-off-by: Nic Cope <nicc@rk0n.org>

We might want to update these to marketplace links once they're
available.

Signed-off-by: Nic Cope <nicc@rk0n.org>

In particular, elaborate on how to test a function that is under
development.

Signed-off-by: Nic Cope <nicc@rk0n.org>

Signed-off-by: Nic Cope <nicc@rk0n.org>

They no longer exist in v1.14

Signed-off-by: Nic Cope <nicc@rk0n.org>

Signed-off-by: Nic Cope <nicc@rk0n.org>

Signed-off-by: Nic Cope <nicc@rk0n.org>

Co-authored-by: Pete Lumbis <pete@upbound.io>

This could look better but it's a good start to make the diagrams match the light/dark theme.

There is a bug in here that switching themes doesn't update the diagram (but it works on future loads)

Signed-off-by: Nic Cope <nicc@rk0n.org>

Co-authored-by: Pete Lumbis <pete@upbound.io>

Signed-off-by: Nic Cope <nicc@rk0n.org>

Honestly mostly to workaround Vale thinking "Go." is a spelling mistake.

Signed-off-by: Nic Cope <nicc@rk0n.org>