refactor(kb): revise articles about secret detection in repositories

knowledge base/gitleaks.md

@@ -0,0 +1,70 @@
+# Gitleaks
+
+Open-source secret scanner for git repositories, files, and directories.
+
+1. [TL;DR](#tldr)
+1. [Further readings](#further-readings)
+   1. [Sources](#sources)
+
+## TL;DR
+
+<details>
+  <summary>Setup</summary>
+
+```sh
+brew install 'gitleaks'
+docker pull 'zricethezav/gitleaks:latest'
+```
+
+</details>
+
+<!-- Uncomment if used
+<details>
+  <summary>Usage</summary>
+
+```sh
+```
+
+</details>
+-->
+
+<!-- Uncomment if used
+<details>
+  <summary>Real world use cases</summary>
+
+```sh
+```
+
+</details>
+-->
+
+## Further readings
+
+- [Website]
+- [Main repository]
+
+Alternatives:
+
+- [`detect-secrets`][detect-secrets]
+- [`ripsecrets`][ripsecrets]
+- [trufflehog]
+
+### Sources
+
+<!--
+  Reference
+  ═╬═Time══
+  -->
+
+<!-- In-article sections -->
+<!-- Knowledge base -->
+[detect-secrets]: detect-secrets.md
+[ripsecrets]: ripsecrets.md
+[trufflehog]: trufflehog.md
+
+<!-- Files -->
+<!-- Upstream -->
+[main repository]: https://github.com/gitleaks/gitleaks
+[website]: https://gitleaks.io/
+
+<!-- Others -->