enable indexer using `compose.indexer.yml` on self-host:
```bash
docker compose -f compose.yml -f compose.indexer.yml up
```
<!-- This is an auto-generated comment: release notes by coderabbit.ai -->
## Summary by CodeRabbit
- **Chores**
- Updated the build process in the development container to include building the reader package.
- Added and configured a Manticore Search indexer service in the development container.
- Removed the indexer service and related environment variables from the self-hosted Docker Compose setup and environment example file.
- **Documentation**
- Improved documentation formatting for better readability.
<!-- end of auto-generated comment: release notes by coderabbit.ai -->
Currently, directly running `yarn dev` in `packages/backend/server` (following `developing-server.md`) instead of `yarn affine server dev` would raise following error:
``` sh
server git:(canary) ✗ yarn dev
[nodemon] 3.1.9
[nodemon] to restart at any time, enter `rs`
[nodemon] watching path(s): *.*
[nodemon] watching extensions: ts,json
[nodemon] starting `node ./src/index.ts`
node:internal/modules/esm/get_format:160
throw new ERR_UNKNOWN_FILE_EXTENSION(ext, filepath);
^
TypeError [ERR_UNKNOWN_FILE_EXTENSION]: Unknown file extension ".ts" for /Users/ewind/code/AFFiNE/packages/backend/server/src/index.ts
at Object.getFileProtocolModuleFormat [as file:] (node:internal/modules/esm/get_format:160:9)
at defaultGetFormat (node:internal/modules/esm/get_format:203:36)
at defaultLoad (node:internal/modules/esm/load:141:22)
at async ModuleLoader.load (node:internal/modules/esm/loader:409:7)
at async ModuleLoader.moduleProvider (node:internal/modules/esm/loader:291:45)
at async link (node:internal/modules/esm/module_job:76:21) {
code: 'ERR_UNKNOWN_FILE_EXTENSION'
}
Node.js v20.10.0
[nodemon] app crashed - waiting for file changes before starting...
```
