feat: generate documentation for proto files (#1064)

Makefile

@@ -20,6 +20,7 @@ devtools:
 	go install google.golang.org/protobuf/cmd/[email protected]
 	go install google.golang.org/grpc/cmd/[email protected]
 	go install github.com/NathanBaulch/[email protected]
+	go install github.com/pseudomuto/protoc-gen-doc/cmd/[email protected]
 	go install github.com/bufbuild/buf/cmd/[email protected]
 	go install mvdan.cc/gofumpt@latest
 	go install github.com/rakyll/[email protected]

www/grpc/buf/buf.gen.yaml

@@ -7,6 +7,14 @@ plugins:
     out: ../gen/go
     opt:
       - paths=source_relative
+  - name: doc
+    out: ../gen/docs
+    opt:
+      - markdown,index.md
+  - name: doc
+    out: ../gen/docs
+    opt:
+      - html,index.html
   - name: go-grpc
     out: ../gen/go
     opt: paths=source_relative,require_unimplemented_servers=false