added support for loading dictionary structure

docs/schema.typ

@@ -2,8 +2,9 @@
 /// This function returns a dictionary of structures
 /// 
 /// Supported formats: #schema.valid-extensions.map(e => raw("." + e)).join(", ")
-/// - path-or-schema (str, raw): If it is a string, defines the path to load. \
-///   If it is a raw block, its content is directly parsed (the block's language will define the format to use)
+/// - path-or-schema (str, raw, dictionary): If it is a string, defines the path to load. \
+///   If it is a raw block, its content is directly parsed (the block's language will define the format to use) \
+///   If it is a dictionary, it directly defines the schema structure
 /// -> dictionary
 #let load(path-or-schema) = {}