chore(helm): remove chart maintainer and update chart README.md

[pmoscode]

Description

As I leave the project, I update the maintainers of the MIW Helm chart.

Pre-review checks

Please ensure to do as many of the following checks as possible, before asking for committer review:

• [x] DEPENDENCIES are up-to-date. Dash license tool. Committers can open IP issues for restricted libs.
• [x] Copyright and license header are present on all affected files

[sonarcloud[bot]]

Quality Gate passed

Kudos, no new issues were introduced!

0 New issues
0 Security Hotspots
No data about Coverage
No data about Duplication

See analysis details on SonarCloud

[github-actions[bot]]

:tada: This PR is included in version 0.4.0-develop.8 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket:

[github-actions[bot]]

:tada: This PR is included in version 0.4.0 :tada:

The release is available on GitHub release

Your semantic-release bot :package::rocket: