build: refine build and script execution environment

- Add build output directories to the PATH
- Add an alias for the run script
- Remove script for bumping versions

Author: bresilla

.envrc

@@ -4,4 +4,6 @@ eval "$(devbox generate direnv --print-envrc)"
 export ENVNAME=rust
 unset GITHUB_TOKEN
 
-export PATH=$PATH:$PWD
+export PATH=$PATH:$PWD:$PWD/target/debug:$PWD/target/release
+
+export_alias _b "./run.sh build"