Add or Update configuration options flags

## Problem
The configuration options on the [website](https://etcd.io/docs/v3.6/op-guide/configuration/) are not up to date with the config.go [code](https://github.com/etcd-io/etcd/blob/main/server/embed/config.go).

This parent issue aims to update configuration flags to reflect these changes on the website.

## Proposal
I propose to create or update existing sections in order to update the configurations of the website to help users configure etcd. [ref](https://github.com/etcd-io/website/issues/532) . It is still a manual process though not optimal. I am happy to hear if there is an automated way.

### Member flags to be updated to reflect the website
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L599-L638

### Raft connection flags (a new section in the website needs to be added for this)
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L599-L638

### Clustering flags to be added or updated
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L645-L681

### Security flags to be added or updated
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L684-L714

### Logging flags to be added or updated
[ ] https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L717-L725 - PR https://github.com/etcd-io/website/pull/1104

### pprof profiler via HTTP
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L728

### Additional metrics
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L731-L737

### Auth
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L740-L742

### Gateway
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L745-L758

### Unsafe features
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L761-L762

### Feature gates
https://github.com/etcd-io/etcd/blob/main/server/embed/config.go#L765

I will send PRs for this, contributions are welcomed.