Cortex v1.11.0 included thanos-io/thanos#3970, which added configuration
options to Azure's http client and transport, replacing usage of
`http.DefaultClient`. Unfortunately since Cortex was not setting this
config, Cortex implicitly switched from `http.DefaultClient` to all
empty values (e.g. `MaxIdleConns: 0` rather than 100).

Introduce `http` config settings to Azure storage. This motivated moving
`s3.HTTPConfig` into a new `pkg/storage/bucket/config` package, to allow
`azure` and `s3` to share it.

Also update the instructions for running the website to include
installing `embedmd`.

Signed-off-by: Andrew Seigner <[email protected]>

also back out changelog cleanup

Signed-off-by: Andrew Seigner <[email protected]>

Signed-off-by: Andrew Seigner <[email protected]>