Horizon Lite: deploy on separate AWS infra

[sreuland]

Get horizon light stack running on separate AWS environment. This is dependent on bulk of infra being provided already by Ops - https://github.com/stellar/ops/issues/1818

Acceptance Criteria:

• [x] horizon light web, index(single/continuous), ledger exporter(continuous) deployed and running
• [x] clone the index and tx-meta s3 buckets over
• [x] horizon light web api ingress url is routed at new deployment.

[sreuland]

@Shaptic , I've deployed the horizon light stack(k8s manifests) into horizon-lite-dev , updated the MVP docs to reflect.

the 'forward/watch' processes are running starting from a ledger of today(42654178) , pointed at the sdf s3 buckets. and the web is up at https://lh-dev-pubnet.prototypes.kube001.services.stellar-ops.com/, once ready, we can take down the older mvp deployment in horizon-dev, and could then change the web url back to https://lighthorizon-pubnet.prototypes.kube001.services.stellar-ops.com/

there are two jobs running on k8s now to copy the horizon s3 buckets over to the sdf s3 buckets.

[Shaptic]

Awesome, looks great to me! I updated the issue to have a checklist to track progress.