Add `config` example to templates
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Issue body
### Bug Description
Template created by `charmcraft init --profile simple` contains a `config.yaml` file. Other profiles - `kubernetes` and `machine` don't contain this file although it is equally relevant.
cc @tmihoc
### To Reproduce
Run
```
$ mkdir simple
$ charmcraft init --profile simple
$ mkdir ../kubernetes
$ cd ../kubernetes
$ charmcraft init --profile kubernetes
$ ls
CONTRIBUTING.md README.md metadata.yaml requirements.txt tests
LICENSE charmcraft.yaml pyproject.toml src tox.ini
$ ls ../simple
CONTRIBUTING.md charmcraft.yaml pyproject.toml tests
LICENSE config.yaml requirements.txt tox.ini
README.md metadata.yaml src
```
### Environment
Multipass vm based on `charm-dev` profile:
```
$ charmcraft version
2.4.1
```
### charmcraft.yaml
```shell
.
```
### Relevant log output
```shell
No relevant logs
```
Evaluation history
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