Update Installation Guide

**Describe the bug**
From Helm v3 the chart installation is:
`helm install [NAME] [CHART] [flags]`

Therefore there is need to update the installation commands in the [guide](https://github.com/apache/couchdb-helm/blob/main/couchdb/README.md) to this new format.

**Version of Helm and Kubernetes**:
Helm: v3.7.1
K8S: Docker Desktop K8S, v1.25.0

**What happened**:
`Error: unknown flag: --name`

**What you expected to happen**:
Chart to install successfully

**How to reproduce it** (as minimally and precisely as possible):
Run the command:
```
helm install \
--name my-release \
--set couchdbConfig.couchdb.uuid=uuid \
couchdb/couchdb
```

**Anything else we need to know**:
LMK If I can go ahead and create a PR for this