docs: Copy in API docs and add link

Make a copy of `apidoc/html` to `docs/reference` and then tell Jekyll to
include it verbatim. This will include the gtk-doc API docs on the
static site. A link is added to the main index.

A script is added to do the copy (a symlink won't do) and is setup to
run before Jekyll in the GitHub workflow. Ideally this would be a local
Jekyll plugin to make the process automatic, but the github-pages gem
doesn't allow that.

1 files changed, 4 insertions, 1 deletions

diff --git a/docs/README.md b/docs/README.md
index 7963b04e..f1f89ecb 100644
--- a/docs/README.md
+++ b/docs/README.md
@@ -22,7 +22,10 @@ bundle config set --local path vendor/bundle
 bundle install
 ```
 
-Finally, render and serve the site locally with Jekyll:
+Finally, run the `prep-docs.sh` script and then render and serve the
+site locally with Jekyll:
+
 ```
+./prep-docs.sh
 bundle exec jekyll serve
 ```