🐳 : Further Docker build Cleanup & Docs Update (#1502)

* refactor: post-cleanup changes:
- add more unnecessary paths to .dockerignore
- remove librechat.yaml from main compose file (prevents from being required)
- do not create librechat.yaml during build (does nothing)

* docs: make config file instructions easier to read, more info throughout other docs

* docs: add custom config to menu

* Update custom_config.md

* Update docker_compose_install.md

.dockerignore

@@ -1,7 +1,17 @@
-node_modules
+**/.circleci
+**/.editorconfig
+**/.dockerignore
+**/.git
+**/.DS_Store
+**/.vscode
+**/node_modules
+
+# Specific patterns to ignore
 data-node
 meili_data*
 librechat*
 Dockerfile*
+docs
+
 # Ignore all hidden files
 .*