chore(server): disable indexer on self-host by default (#12452)

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 -->

.docker/selfhost/.env.example

@@ -21,8 +21,3 @@ CONFIG_LOCATION=~/.affine/self-host/config
 DB_USERNAME=affine
 DB_PASSWORD=
 DB_DATABASE=affine
-
-# indexer search provider manticoresearch version
-MANTICORE_VERSION=9.2.14
-# position of the manticoresearch data to persist 
-MANTICORE_DATA_LOCATION=~/.affine/self-host/manticore

.docker/selfhost/compose.yml

@@ -10,8 +10,6 @@ services:
         condition: service_healthy
       postgres:
         condition: service_healthy
-      indexer:
-        condition: service_healthy
       affine_migration:
         condition: service_completed_successfully
     volumes:
@@ -23,7 +21,7 @@ services:
     environment:
       - REDIS_SERVER_HOST=redis
       - DATABASE_URL=postgresql://${DB_USERNAME}:${DB_PASSWORD}@postgres:5432/${DB_DATABASE:-affine}
-      - AFFINE_INDEXER_SEARCH_ENDPOINT=http://indexer:9308
+      - AFFINE_INDEXER_ENABLED=false
     restart: unless-stopped
 
   affine_migration:
@@ -39,14 +37,12 @@ services:
     environment:
       - REDIS_SERVER_HOST=redis
       - DATABASE_URL=postgresql://${DB_USERNAME}:${DB_PASSWORD}@postgres:5432/${DB_DATABASE:-affine}
-      - AFFINE_INDEXER_SEARCH_ENDPOINT=http://indexer:9308
+      - AFFINE_INDEXER_ENABLED=false
     depends_on:
       postgres:
         condition: service_healthy
       redis:
         condition: service_healthy
-      indexer:
-        condition: service_healthy
 
   redis:
     image: redis
@@ -78,24 +74,3 @@ services:
       timeout: 5s
       retries: 5
     restart: unless-stopped
-
-  indexer:
-    image: manticoresearch/manticore:${MANTICORE_VERSION:-9.2.14}
-    container_name: affine_indexer
-    volumes:
-      - ${MANTICORE_DATA_LOCATION}:/var/lib/manticore
-    ulimits:
-      nproc: 65535
-      nofile:
-        soft: 65535
-        hard: 65535
-      memlock:
-        soft: -1
-        hard: -1
-    healthcheck:
-      test:
-        ['CMD', 'wget', '-O-', 'http://127.0.0.1:9308']
-      interval: 10s
-      timeout: 5s
-      retries: 5
-    restart: unless-stopped