"Envoy Era Ends: Codebase Cleansed of Obsolete References!"

"In a decisive move, developers bid farewell to Envoy, streamlining deployment processes and embracing a new era for gRPC integration."

Commit Details:

[chore] Remove remaining Envoy references (#2037) ## Motivation We no longer encourage using the grpc-web integration, therefore there's no need for Envoy to be used when deploying hubs any more. ## Change Summary Remove all references to Envoy. - [x] PR title adheres to the [conventional commits](https://www.conventionalcommits.org/en/v1.0.0/) standard - [ ] PR has a [changeset](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#35-adding-changesets) - [x] PR has been tagged with a change label(s) (i.e. documentation, feature, bugfix, or chore) - [ ] PR includes [documentation](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#32-writing-docs) if necessary. - [x] All [commits have been signed](https://github.com/farcasterxyz/hub-monorepo/blob/main/CONTRIBUTING.md#22-signing-commits) <!-- start pr-codex --> --- ## PR-Codex overview The focus of this PR is to remove unused files related to Envoy in the `hubble` app and refactor some functions for better clarity. ### Detailed summary - Removed unused Envoy-related files (`README.md`, `envoy.yaml`, `envoy-start.sh`) - Refactored functions for fetching and storing files - Updated Docker installation message - Improved crontab setup logic > ✨ Ask PR-Codex anything about this PR by commenting with `/codex {your question}` <!-- end pr-codex -->