Update page on media types (#16)

* Update page on media types

Made the page more general, to accomodate for future new specs based on the Jelly RDF serialization format (for example Jelly RDF Patch). Made the language consistent with the spec ("recommended" extension and media type).

* Reformat

docs/specification/index.md

@@ -6,8 +6,10 @@
 
 See the specification pages for more details:
 
-- [Serialization format specification](serialization.md)
-- [gRPC streaming protocol specification](streaming.md)
-- [Protobuf reference](reference.md)
-- [Protobuf sources](protobuf-source.md)
-- [File extension and media type](media-type.md)
+- Specification documents:
+    - [Serialization format specification](serialization.md)
+    - [gRPC streaming protocol specification](streaming.md)
+- Protobuf definitions:
+    - [Protobuf reference](reference.md)
+    - [Protobuf sources](protobuf-source.md)
+- [File extensions and media types](media-type.md)

docs/specification/media-type.md

@@ -1,9 +1,10 @@
-# File extension and media type
+# File extensions and media types
 
-Jelly is not tied to any specific file extension and does not have a registered media type. However, you can use the following:
+We recommend using these file extensions and media types when working with Jelly:
 
-- File extension: `.jelly`
-- Media type: `application/x-jelly-rdf`
+| Format | File extension | Media type |
+| --- | --- | --- |
+| **[Jelly RDF serialization](serialization.md)** | `.jelly` | `application/x-jelly-rdf` |
 
 The files should be saved in the [delimited variant of Jelly](serialization.md#delimited-variant-of-jelly).
 

mkdocs.yml

@@ -97,7 +97,7 @@ nav:
     - gRPC streaming protocol: 'specification/streaming.md'
     - Protobuf reference: 'specification/reference.md'
     - Protobuf source: 'specification/protobuf-source.md'
-    - File extension and media type: 'specification/media-type.md'
+    - File extensions and media types: 'specification/media-type.md'
 
   - JVM (Scala) implementation ⮺: 'https://w3id.org/jelly/jelly-jvm/'