docs: Move Installation and Quickstart (Usage) under Getting started

Moved Installation and Usage (Quickstart) under Getting started section
Rename installation folder to documentation folder
Rename installation/index.md to documentation/installation.md
Duplicate usage/index.md to documentation directory and rename it to documentation/quickstart.md
Add redirection from installation and usage

Signed-off-by: Ryan S <ryansoliveres@users.noreply.github.com>

docs/documentation/quickstart.md

@@ -0,0 +1,45 @@
+## Basic usage
+
+### Python
+
+In Docling, working with documents is as simple as:
+
+1. converting your source file to a Docling document
+2. using that Docling document for your workflow
+
+For example, the snippet below shows conversion with export to Markdown:
+
+```python
+from docling.document_converter import DocumentConverter
+
+source = "https://arxiv.org/pdf/2408.09869"  # file path or URL
+converter = DocumentConverter()
+doc = converter.convert(source).document
+
+print(doc.export_to_markdown())  # output: "### Docling Technical Report[...]"
+```
+
+Docling supports a wide array of [file formats](./supported_formats.md) and, as outlined in the
+[architecture](../concepts/architecture.md) guide, provides a versatile document model along with a full suite of
+supported operations.
+
+### CLI
+
+You can additionally use Docling directly from your terminal, for instance:
+
+```console
+docling https://arxiv.org/pdf/2206.01062
+```
+
+The CLI provides various options, such as 🥚[GraniteDocling](https://huggingface.co/ibm-granite/granite-docling-258M) (incl. MLX acceleration) & other VLMs:
+```bash
+docling --pipeline vlm --vlm-model granite_docling https://arxiv.org/pdf/2206.01062
+```
+
+For all available options, run `docling --help` or check the [CLI reference](../reference/cli.md).
+
+## What's next
+
+Check out the Usage subpages (navigation menu on the left) as well as our [featured examples](../examples/index.md) for
+additional usage workflows, including conversion customization, RAG, framework integrations, chunking, serialization,
+enrichments, and much more!

mkdocs.yml

@@ -53,11 +53,11 @@ theme:
     - toc.follow
 nav:
   - Documentation:
-    - "Docling documentation": index.md
-    - Installation:
-      - Installation: installation/index.md
+    - Documentation: index.md
+    - Getting started : 
+      - "Installation": documentation/installation.md
+      - "Quickstart": documentation/quickstart.md
     - Usage:
-      - Usage: usage/index.md
       - Advanced options: usage/advanced_options.md
       - Supported formats: usage/supported_formats.md
       - Enrichment features: usage/enrichments.md
@@ -183,6 +183,8 @@ plugins:
   - redirects:
       redirect_maps:
         getting_started/index.md: index.md
+        installation/index.md: documentation/installation.md
+        usage/index.md: documentation/quickstart.md
   - mkdocs-jupyter
   - mkdocstrings:
       default_handler: python