update site for 1.0.0

Author: zkat

src/_includes/partials/description.md

@@ -18,4 +18,6 @@ based on JSON Schema.
 The language is based on [SDLang](https://sdlang.org), with a number of
 modifications and clarifications on its syntax and behavior.
 
+The current version of the KDL spec is `1.0.0`.
+
 </section>

src/_includes/partials/overview.md

@@ -137,6 +137,20 @@ mynode /-"commented" "not commented" /-key="value" /-{
 }
 ```
 
+### Type Annotations
+
+KDL supports type annotations on both values and nodes. These can be
+arbitrary, but can be used by individual implementations or use-cases to
+constrain KDL's basic types. A number of type names are also reserved to have
+specific meanings.
+
+```kdl
+numbers (u8)10 (i32)20 myfloat=(f32)1.5 {
+  strings (uuid)"123e4567-e89b-12d3-a456-426614174000" (date)"2021-02-03" filter=(regex)r"$\d+"
+  (author)person name="Alex"
+}
+```
+
 ### More Details
 
 ```kdl
@@ -156,7 +170,7 @@ smile "😁"
 foo123~!@#$%^&*.:'|/?+ "weeee"
 
 // And you can also use unicode!
-ノード　お名前＝"☜(ﾟヮﾟ☜)"
+ノード　お名前="☜(ﾟヮﾟ☜)"
 
 // kdl specifically allows properties and values to be
 // interspersed with each other, much like CLI commands.