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/explorer-setup.md

@@ -4,10 +4,11 @@ description: "Install the Explorer extras, save a ContextGraph to JSON, and laun
 icon: "map"
 ---
 
-`semantica-explorer` is an interactive browser dashboard for knowledge graph exploration. You give it a graph file, it starts a local server, and opens a browser tab where you can search nodes, find paths, inspect provenance, and run analytics — no code required after launch.
+**`semantica-explorer`** is an **interactive browser dashboard** for knowledge graph exploration. You give it a graph file, it starts a local server, and opens a browser tab where you can search nodes, find paths, inspect provenance, and run analytics — no code required after launch.
 
 This page covers everything needed to go from zero to a running Explorer. For the full REST API reference and endpoint catalogue, see [Explorer Reference](reference/explorer).
 
+
 ## Prerequisites
 
 The Explorer depends on FastAPI and uvicorn, which are not included in the base install:
@@ -28,6 +29,7 @@ semantica-explorer --help
 
 You should see the usage message with the four available flags. If you see `command not found`, activate your virtual environment first. See [CLI Setup](cli-setup#troubleshooting) for PATH help.
 
+
 ## Minimal End-to-End Example
 
 The following four steps are everything needed to get Explorer running:
@@ -57,6 +59,7 @@ curl http://127.0.0.1:8000/api/health
 # {"status": "healthy"}
 ```
 
+
 ## Step 1 — Build and Save a ContextGraph
 
 Explorer loads a graph from a JSON file on disk. You need to create that file first.
@@ -109,6 +112,7 @@ Explorer loads a graph from a JSON file on disk. You need to create that file fi
   Already have a graph from a pipeline run? Skip straight to Step 2. The only requirement is that the file was saved with `ContextGraph.save_to_file()`.
 </Tip>
 
+
 ## Step 2 — Launch Explorer
 
 ```bash
@@ -127,13 +131,14 @@ The startup sequence prints:
 
 The browser opens automatically at `http://127.0.0.1:8000` shortly after the server starts.
 
+
 ## CLI Flags
 
 `semantica-explorer` accepts exactly four flags:
 
 | Flag | Short | Default | Description |
-| ---- | ----- | ------- | ----------- |
-| `--graph` | `-g` | *(required)* | Path to a ContextGraph JSON file |
+| :---- | :----- | :------- | :----------- |
+| `--graph` | `-g` | *(**required**)* | Path to a ContextGraph JSON file |
 | `--port` | `-p` | `8000` | Port to bind the server |
 | `--host` | — | `127.0.0.1` | Host to bind the server |
 | `--no-browser` | — | off | Do not open a browser tab automatically |
@@ -160,18 +165,20 @@ semantica-explorer --graph my_graph.json --no-browser
   `--host 0.0.0.0` makes Explorer reachable on every network interface. The server has no built-in authentication. Only use this on a trusted private network.
 </Warning>
 
+
 ## Browser Access
 
 Once the server is running:
 
 | URL | What you get |
-| --- | ------------ |
+| :--- | :------------ |
 | `http://127.0.0.1:8000` | Interactive dashboard |
 | `http://127.0.0.1:8000/docs` | Swagger UI — every REST endpoint, interactive |
 | `http://127.0.0.1:8000/api/health` | Health check — `{"status": "healthy"}` |
 
 The browser tab opens shortly after startup. If it does not open, navigate to the URL manually or pass `--no-browser` and open it yourself.
 
+
 ## Running as a Python Module
 
 If `semantica-explorer` is not on `PATH`, use the module form:
@@ -180,6 +187,7 @@ If `semantica-explorer` is not on `PATH`, use the module form:
 python -m semantica.explorer --graph my_graph.json --port 8080
 ```
 
+
 ## Common Startup Errors
 
 **`Error: graph file not found: my_graph.json`**
@@ -228,6 +236,7 @@ semantica-explorer --graph my_graph.json --host 0.0.0.0
 
 This is expected in headless, SSH, and container environments. Add `--no-browser` to suppress the warning and open `http://127.0.0.1:8000` in a browser that has network access to the server.
 
+
 ## What Explorer Gives You
 
 Once running, Explorer exposes a REST API and dashboard for: