Migrate spec/latest/.htaccess.

Some handled slashes, some did not. These should match what was
previously in place.

Author: BigBlueHat

_redirects

@@ -1,3 +1,15 @@
 /playground-dev /playground 302
 
 /contexts/schema.org.jsonld http://schema.org/ 301
+
+/spec/latest/json-ld-syntax https://www.w3.org/TR/json-ld/ 301
+/spec/latest/json-ld-syntax/ https://www.w3.org/TR/json-ld/ 301
+
+/spec/latest/json-ld/* https://www.w3.org/TR/json-ld/:splat 301
+/spec/latest/json-ld-api/* https://www.w3.org/TR/json-ld-api/:splat 301
+/spec/latest/json-ld-framing/* https://www.w3.org/TR/json-ld-framing/:splat 301
+
+/spec/latest/rdf-graph-normalization https://w3c-ccg.github.io/rdf-dataset-canonicalization/spec/ 307
+/spec/latest/rdf-graph-normalization/* https://w3c-ccg.github.io/rdf-dataset-canonicalization/spec/:splat 307
+/spec/latest/rdf-dataset-normalization/* https://w3c-ccg.github.io/rdf-dataset-canonicalization/spec/:splat 307
+/spec/latest/rdf-dataset-canonicalization/* https://w3c-ccg.github.io/rdf-dataset-canonicalization/spec/:splat 307