Pages and tour entries for the modules that had none

Reference pages for (std uuid), (std scan), (std priority-queue),
(std crypto hash) and (text encodings), and entries for them in the
tour of the standard library, with (text xml), (text json-codec) and
(text bjodat-core). The text/json entry links to its page instead of
prelude.org.

🤖 Generated with [ECA](https://eca.dev)

Co-Authored-By: eca-agent <git@eca.dev>

modules/std/crypto/hash.sz

@@ -0,0 +1,3 @@
+(meta (title "(std crypto hash)"))
+
+@generate-docs[#:module "std crypto hash"]

modules/std/crypto/index.sz

@@ -0,0 +1,2 @@
+(meta (title "(std crypto)")
+      (sort title))

modules/std/priority-queue.sz

@@ -0,0 +1,3 @@
+(meta (title "(std priority-queue)"))
+
+@generate-docs[#:module "std priority-queue"]

modules/std/scan.sz

@@ -0,0 +1,3 @@
+(meta (title "(std scan)"))
+
+@generate-docs[#:module "std scan"]

modules/std/uuid.sz

@@ -0,0 +1,3 @@
+(meta (title "(std uuid)"))
+
+@generate-docs[#:module "std uuid"]

modules/text/encodings.sz

@@ -0,0 +1,3 @@
+(meta (title "(text encodings)"))
+
+@generate-docs[#:module "text encodings"]