docs: upgrade all docs pages with Mintlify premium components (#642)

Replace plain markdown lists, tables, and numbered steps with interactive
Mintlify v3 MDX components across all 50+ documentation files:

- Tabs: provider/parser/method selection guides, citation formats, component details
- Steps: setup flows, pipeline stages, connection initialization
- CardGroup/Card: feature overviews, "what you get" sections, navigation footers
- AccordionGroup: FAQ entries
- Check/Warning/Tip/Note/Info: callouts replacing plain bold text and inline notes

Files improved span the full docs surface: reference modules (context, llms,
kg, reasoning, embeddings, deduplication, provenance, parse, ontology, core,
semantic_extract), integrations (agno, docling, snowflake), graph/vector
store backends (apache_age, pgvector), and top-level guides (contributing,
governance, glossary, citation, community-projects, learning-more).

docs/reference/export.md

@@ -4,12 +4,19 @@ description: "Export knowledge graphs to RDF, Parquet, LPG, ArangoDB AQL, CSV, G
 icon: "file-export"
 ---
 
-`semantica.export` serializes knowledge graphs to every downstream format — semantic web standards, analytics pipelines, graph databases, and vector stores.
+**`semantica.export`** serializes knowledge graphs to **every downstream format**:
+
+- RDF: Turtle, JSON-LD, N-Triples, RDF/XML — with optional W3C PROV-O provenance inline
+- Analytics: Apache Parquet and Arrow for Spark, BigQuery, Databricks
+- Graph databases: Cypher `CREATE` statements for Neo4j; AQL `INSERT` for ArangoDB
+- Standard formats: GraphML, GEXF, Graphviz DOT, CSV, OWL 2.0
+- Vector export: NumPy `.npz`, FAISS index, binary for embedding pipelines
+
 
 ## Exported Classes
 
 | Class | Output formats | Notes |
-| --- | --- | --- |
+| :--- | :--- | :--- |
 | `RDFExporter` | Turtle, JSON-LD, N-Triples, RDF/XML | `export_to_rdf()` → string; `export()` → file |
 | `ParquetExporter` | `.parquet` | Requires `pyarrow`; explicit typed schema |
 | `LPGExporter` | Cypher `CREATE` | Neo4j and Memgraph compatible |
@@ -321,7 +328,7 @@ The `export_csv` convenience function delegates to `CSVExporter.export()`. For p
 ## Format Reference
 
 | Format string | Canonical name | Exporter | File ext | Best for |
-| --- | --- | --- | --- | --- |
+| :--- | :--- | :--- | :--- | :--- |
 | `"turtle"` / `"ttl"` | `turtle` | `RDFExporter` | `.ttl` | Readable RDF, ontology sharing |
 | `"jsonld"` / `"json-ld"` | `jsonld` | `RDFExporter` | `.jsonld` | APIs, Linked Data, JSON pipelines |
 | `"ntriples"` / `"nt"` | `ntriples` | `RDFExporter` | `.nt` | Streaming RDF, line-by-line processing |