docs: add choose-your-module onboarding guide (#651)

* docs: add choose-your-module onboarding guide

* fix(docs): correct export code examples against actual API signatures

- export_to_rdf() returns a string; use export() for file output
- format="json-ld" is invalid; correct value is "jsonld"
- ParquetExporter/LPGExporter/ArangoAQLExporter take file_path as a
  required positional arg, not output= / output_dir= kwargs
- ArangoAQLExporter().export(graph) was missing file_path entirely,
  which would raise TypeError at runtime
- Remove misleading 'with provenance embedded' comment (no such param)

---------

Co-authored-by: KaifAhmad1 <kaifahmad087@gmail.com>

docs/docs.json

@@ -65,6 +65,7 @@
             "pages": [
               "concepts",
               "modules",
+              "choose-your-module",
               "glossary"
             ]
           },
@@ -104,10 +105,11 @@
             "group": "Get Started",
             "pages": [
               "installation",
-              "cli-setup",
-              "explorer-setup",
+              "getting-started",
               "quickstart",
-              "getting-started"
+              "choose-your-module",
+              "cli-setup",
+              "explorer-setup"
             ]
           }
         ]