docs: add requirements to DEVELOPING.md

DEVELOPING.md

@@ -2,6 +2,13 @@
 
 Thanks a lot for contributing to Komga!
 
+## Requirements
+
+You will need:
+
+- Java JDK version 8 or 11
+- Nodejs version 10+, with `npm` version 6+
+
 ## Commit messages
 
 Komga's commit messages follow the [Conventional Commits](https://www.conventionalcommits.org/) standard. This enables automatic versioning, releases, and release notes generation.
@@ -21,8 +28,6 @@ Komga is composed of 2 projects:
 Komga uses Spring Profiles extensively:
 - `dev`: add more logging, disable periodic scanning, in-memory database
 - `localdb`: a dev profile that stores the database in `./testdb`.
-- `noflyway`: disable Flyway. Only useful when adding new entities and you want Hibernate to update the database for you.
-- `generatesql`: used manually to write the SQL generated by Hibernate. Useful when adding new entities.
 
 ### Gradle tasks
 
@@ -32,6 +37,7 @@ Here is a list of useful tasks:
 - `bootRun`: run the application locally, useful for testing your changes.
 - `copyWebDist`: build the frontend, and copy the bundle to `/resources/public`. You need to run this manually if you want to test the latest frontend build hosted by Spring.
 - `test`: run automated tests. Always run this before committing.
+- `jooq-codegen-primary`: generates the jOOQ DSL.
 
 `bootRun` needs to be run with a profile or list of profiles, usually:
 - `dev`: when testing with a blank database