chore: rm compilation support script, update docs

RELEASE.md

@@ -16,8 +16,6 @@ Pay special attention to the `README` and `docker-compose` files.
 For instance, for the Bolt sidecar this is in `bolt-sidecar/Cargo.toml`.
 Similar changes should be made in the other packages getting updated.
 
-We don't currently keep track of the version for flashbots forks.
-
 Next, update the version of the Docker images used in any `docker-compose` files.
 These currently only live inside the `testnets/` dir.
 
@@ -29,9 +27,10 @@ We use the built-in Github changelog feature to generate the changelog.
 
 ## 3. Build new Docker images
 
-You can build new Docker images with the `just release <tag>` recipe.
+You can build new Docker images with the `just build-and-push-all-images <tag>` recipe.
 
-Example: `just release v0.2.0-alpha` will build and push the Docker images
+Example: `just build-and-push-all-images v0.2.0-alpha` will build and push the Docker images
 for all Bolt components with the tag `v0.2.0-alpha` for both `arm64` and `amd64`
-architectures. This can take a long time... We recommend building from an ARM machine
-because cross-compiling from x86 into ARM is slow as hell.
+architectures. This can take a long time.
+
+Since we use cross compilation, we recommend running this from an x86_64 linux box.