docs: add index.md for Linux & Sysadmin section

01-linux/index.md

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+# 🐧 Linux & Sysadmin
+
+A collection of guides covering Linux administration, shell scripting, networking, and distro-specific topics.
+
+## Files & Permissions
+
+- [Linux File Permissions and Ownership](files-permissions/linux-file-permissions.md)
+
+## Networking
+
+- [SSH Config & Key Management](networking/ssh-config-key-management.md)
+
+## Package Management
+
+- [Package Management Reference](packages/package-management-reference.md)
+
+## Process Management
+
+- [Managing Linux Services with systemd](process-management/managing-linux-services-systemd-ansible.md)
+
+## Shell & Scripting
+
+- [Ansible Getting Started](shell-scripting/ansible-getting-started.md)
+- [Bash Scripting Patterns](shell-scripting/bash-scripting-patterns.md)
+
+## Distro-Specific
+
+- [Linux Distro Guide for Beginners](distro-specific/linux-distro-guide-beginners.md)
+- [WSL2 Instance Migration to Fedora 43](distro-specific/wsl2-instance-migration-fedora43.md)