🐳 : Improving Docker Build (#1415)

* Improving builds

When adding LibreChat to ansible, it rebuilt way too often, even if I
only changed the configuration.
With this PR, it should build only when the files of the app change.
Also removed the 'volumes' section for the 'api' in the docker-compose.yml.
At least with our installation it works fine like this.

* @danny-avila's comments

- removed 'env_file' from docker-compose.yml
- re-added link to '.env' in volumes

* Adding latest changes from main

* @danny-avila's comments

* Updating installation instructions

* @danny-avila's comments

- Remove unused environment in docker-compose.yml
- Re-add some steps for cleaning docker images

.dockerignore

@@ -1,6 +1,7 @@
-**/node_modules
-client/dist/images
+node_modules
 data-node
-.env
-**/.env
-librechat.yaml
+meili_data*
+librechat*
+Dockerfile*
+# Ignore all hidden files
+.*