docs: small updates to config related docs

docs/configuration-format.md

@@ -49,14 +49,24 @@ provide autocompletions and simple type error detection.
 
 ## Generating configuration files
 
-Install the `bloop-config` dependency in your `build.sbt`:
+Install the [`bloop-config`](https://github.com/scalacenter/bloop-config)
+dependency in your build:
+
+_sbt_
+
+```scala
+libraryDependencies += "ch.epfl.scala" %% "bloop-config" % "1.5.5"
+```
+
+_mill_
 
 ```scala
-libraryDependencies += "ch.epfl.scala" %% "bloop-config" % "1.1.0"
+def ivyDeps = Agg(ivy"ch.epfl.scala::bloop-config:1.5.5")
 ```
 
-The `bloop-config` module is published to Maven Central and implements encoders and decoders to read
-and write configuration files. Once the library is added in your build:
+`bloop-config` is published for 2.11-2.13 on the JVM and JS. It implements
+encoders and decoders to read and write configuration files. Once the library is
+added in your build:
 
 1. Create an instance of `bloop.config.Config.File` and populate all its fields.
 2. Write the json file to a `target` path with `bloop.config.Config.File.write(config, target)`.

docs/contributing-guide.md

@@ -11,6 +11,19 @@ sidebar_label: Contributing Guide
 1. Check that you have Node v12.10.0 or newer by running `node -v`
 1. Read and abide by the [Scala Code of Conduct](https://www.scala-lang.org/conduct/).
 
+## Ensure you're in the right repo
+
+Before getting started you'll want to make sure you're in the right place. Some
+tools like [Mill](https://com-lihaoyi.github.io/mill/mill/Intro_to_Mill.html)
+have their Bloop integration built-in, whereas others like
+[sbt](https://www.scala-sbt.org/) are in here. If you're working on an
+integration, make sure it's in this repo
+
+If you're making changes to the actual config structure, you'll want to make
+those changes in the
+[scalacenter/bloop-config](https://github.com/scalacenter/bloop-config) repo,
+which will then need to be released and included in this build.
+
 ## Project structure
 
 Here's a list of the most important directories in the bloop repositories.
@@ -25,7 +38,6 @@ tooling infrastructure.
 
 1. `bridges` contains Scala code written against Scala.js and Scala Native tooling APIs in a version-agnostic way.
 1. `buildpress` is an application that given a list of `(project-name, vcs-uri)` will export a build to bloop.
-1. `config` contains a Scala 2.10 and 2.11-2.13 module to read and write configuration files.
 1. `docs` and `docs-gen` define our docs infrastructure.
 1. `benchmark-bridge` and `benchmarks` define our compiler benchmark infrastructure.
 1. `launcher` is an application to spawn a bloop server and establish a