Update contributing docs based on new website setup

.github/PULL_REQUEST_TEMPLATE.md

@@ -10,12 +10,7 @@ but should be mostly understandable without following the links (e.g. when
 reading the git commit log).
 
 If you are updating the documentation, please do it in separate PRs from
-code changes. Use the following structure for your documentation PR:
-
-* The first commit in the PR should include the changes to the files under site/
-  and the name of the commit should start with `Docs:`.
-* The second commit should be the generated content from running `make docs`.
-  The commit message should be `Regenerate docs`.
+code changes and the commit message should start with `Docs:`.
 
 **PLEASE REMOVE THIS COMMENT BLOCK BEFORE SUBMITTING THE PR** (the bits
 between the arrows)

CONTRIBUTING.md

@@ -49,13 +49,8 @@ Conduct].
 
 ## Contributing to docs
 
-If you are updating the documentation, please do it in separate PRs from code
-changes. Use the following structure for your documentation PR:
-
-- The first commit in the PR should include the changes to the files under
-  [site/] and the name of the commit should start with `Docs:`.
-- The second commit should be the generated content from running `make docs`.
-  The commit message should be `Regenerate docs`.
+If you are updating the documentation, please do it in separate PRs from
+code changes and the commit message should start with `Docs:`.
 
 ### Run the docs locally
 
@@ -74,9 +69,8 @@ It's usually a good idea to test locally for the following:
 ### Update docs
 
 Docs are under [site/] and use the [docsy] theme for hugo. Learn more about
-docsy from [docsy docs]. Regenerate the docs with:
-
-`make docs`
+docsy from [docsy docs]. The site itself are generated from the markdown
+automatically after commit.
 
 ### Adding or updating catalog functions
 

Makefile

@@ -86,11 +86,5 @@ gencatalog:
 	rm site/content/en/guides/consumer/function/catalog/_index.md
 	(cd site/content/en/guides/consumer/function/catalog/catalog && npm run gen-docs)
 
-gendocs:
-	rm -rf docs/
-	(cd site && env HUGO_ENV="production" hugo)
-
-docs: gencatalog lintdocs gendocs license
-
 servedocs:
 	(cd site && go run github.com/gohugoio/hugo server)