docker container cleanup

[NiloCK]

Problem

When working with git worktrees or multiple clones of the repository on
the same machine, the CouchDB Docker container setup can cause
conflicts. This happens because:

1. Multiple worktrees try to use the same container name
   (skuilder-test-couch)
2. Docker attempts to mount volumes to paths that may already exist in
   other containers
3. This results in errors like:

   Error response from daemon: failed to create task for container:
   

failed to create shim task: OCI runtime create failed: runc create
failed: unable to start container process: error during container init:
error mounting "/path/to/local.ini" to rootfs at
"/opt/couchdb/etc/local.ini"

## Solution

Automatic cleanup process in the `dev-couchdb.js` script that runs
before starting CouchDB. This process:

1. Checks if a container with the name `skuilder-test-couch` already
exists
2. If it exists:
- Stops the container if it's running
- Removes the container
3. Continues with the normal start process using the test-couch.sh
script

This ensures that each time you start CouchDB, you get a fresh container
without conflicts from previous runs or other worktrees.