Pkl: update; fix incorrect I/O

Closes #123.

README.md

@@ -328,12 +328,12 @@ Listed below are restricted programming language interpreters and templating too
     * **Syntax:** Extended JSON
     * **I/O:** None
     * **Description:** A functional configuration language. Has a standard formatting tool.
-* [Pkl](https://pkl-lang.org/index.html)
+* [Pkl](https://pkl-lang.org/)
     * **Output format:** JSON, YAML, macOS property list, Java `.properties`
-    * **Turing-complete:** Yes?
+    * **Turing-complete:** Yes
     * **Syntax:** Curly-brace
-    * **I/O:** None
-    * **Description:** A command-line tool, Java library, and build tool plugin. Can generate code for Go, Java, Kotlin, and Swift. [“Pkl vs. Other Config Languages”](https://pkl-lang.org/main/current/introduction/comparison.html#other-config-langs).
+    * **I/O:** The CLI can read environment variables and files, `GET` HTTP(S) URLs. It can import modules from files and HTTP(S) URLs.
+    * **Description:** A command-line tool, Java library, and build tool plugin. Can generate code for Go, Java, Kotlin, and Swift. ["Pkl vs. Other Config Languages"](https://pkl-lang.org/main/current/introduction/comparison.html#other-config-langs).
 * [rjsone](https://github.com/wryun/rjsone)
     * **Output format:** JSON, YAML
     * **Turing-complete:** No?

data/projects.toml

@@ -671,15 +671,15 @@ Syntax = "Extended JSON"
 Description = "A functional configuration language. Has a standard formatting tool."
 
 [Pkl]
-url = "https://pkl-lang.org/index.html"
+url = "https://pkl-lang.org/"
 tags = ["template"]
 
 [Pkl.props]
 "Output format" = "JSON, YAML, macOS property list, Java `.properties`"
-Turing-complete = "Yes?"
+Turing-complete = "Yes"
 Syntax = "Curly-brace"
-"I/O" = "None"
-Description = "A command-line tool, Java library, and build tool plugin. Can generate code for Go, Java, Kotlin, and Swift. [“Pkl vs. Other Config Languages”](https://pkl-lang.org/main/current/introduction/comparison.html#other-config-langs)."
+"I/O" = "The CLI can read environment variables and files, `GET` HTTP(S) URLs. It can import modules from files and HTTP(S) URLs."
+Description = "A command-line tool, Java library, and build tool plugin. Can generate code for Go, Java, Kotlin, and Swift. [\"Pkl vs. Other Config Languages\"](https://pkl-lang.org/main/current/introduction/comparison.html#other-config-langs)."
 
 [rjsone]
 url = "https://github.com/wryun/rjsone"