pkl: add page (#18024)

* Add Pkl CLI documentation

New TLDR proposed page for the Pkl CLI, an embedded configuration language with rich support for validation and tooling.

* Apply suggestion from @TheRootDaemon

Co-authored-by: Harshavardhan <harshath3018@gmail.com>

* Improve clarity in Pkl CLI documentation

Updated markdown formatting for Pkl command line interface documentation.

* Revise Pkl documentation for clarity

* Update pages/common/pkl.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

* Update pages/common/pkl.md

Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

---------

Co-authored-by: Harshavardhan <harshath3018@gmail.com>
Co-authored-by: Managor <42655600+Managor@users.noreply.github.com>

pages/common/pkl.md

@@ -0,0 +1,28 @@
+# pkl
+
+> Manages, evaluates, and tests Pkl configuration modules.
+> More information: <https://pkl-lang.org/main/current/pkl-cli>.
+
+- Evaluate the given Pkl modules and produce their rendering results:
+
+`pkl eval {{module.pkl}}`
+
+- Run as a server that communicates over standard input/output:
+
+`pkl server`
+
+- Evaluate Pkl modules as tests and produces a report:
+
+`pkl test {{module.pkl}}`
+
+- Start a REPL session:
+
+`pkl repl`
+
+- Prepare a Pkl project for publishing as a package:
+
+`pkl project package {{path/to/project_directory}}`
+
+- Resolve project dependencies and writes the resolved versions to a file at path `PklProject.deps.json`:
+
+`pkl project resolve {{path/to/project_directory}}`