refactor(kb/postgres): group related articles into a dedicated folder

knowledge base/postgresql/pg_dump.md

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+# pg_dump
+
+> [!caution]
+> TODO
+
+Intro
+
+<!-- Remove this line to uncomment if used
+## Table of contents <!-- omit in toc -->
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<!-- Uncomment if used
+<details>
+  <summary>Setup</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Usage</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [PostgreSQL]
+- [pg_dumpall]
+- [pg_restore]
+
+### Sources
+
+- [Documentation]
+- [A Complete Guide to pg_dump With Examples, Tips, and Tricks]
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+[pg_dumpall]: pg_dumpall.md
+[pg_restore]: pg_restore.md
+[PostgreSQL]: README.md
+
+<!-- Files -->
+<!-- Upstream -->
+[Documentation]: https://www.postgresql.org/docs/current/app-pgdump.html
+
+<!-- Others -->
+[A Complete Guide to pg_dump With Examples, Tips, and Tricks]: https://www.dbvis.com/thetable/a-complete-guide-to-pg-dump-with-examples-tips-and-tricks/