docs: Add silent installation guide for enterprise deployments

[jeanfbrito]

Add comprehensive documentation covering:

• Silent install commands for Windows (NSIS, MSI), macOS (PKG, DMG), and Linux (DEB, RPM, AppImage, Snap, Flatpak)
• System and network requirements
• Post-installation configuration (servers.json, overridden-settings.json)
• Enterprise deployment scenarios (Group Policy, SCCM/Intune, MDM, Ansible)
• Installation verification commands
• Troubleshooting guide and exit codes
• Automation best practices with error handling examples

Closes #ISSUE_NUMBER

Summary by CodeRabbit

• Documentation
  • Added comprehensive Silent Installation Guide covering Windows, macOS, and Linux platforms, including installation commands, configuration options, enterprise deployment scenarios, and troubleshooting guidance.

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[coderabbitai]

Walkthrough

A comprehensive Silent Installation Guide document is added, detailing unattended deployment procedures for Rocket.Chat Desktop across Windows, macOS, and Linux platforms, including installer-specific commands, configuration options, enterprise deployment scenarios, and troubleshooting guidance.

Changes

Cohort / File(s)

Summary

Silent Installation Documentation docs/silent-installation.md

Adds comprehensive guide (+924 lines) covering unattended installation procedures across multiple platforms and installers (NSIS, MSI, PKG, DMG, DEB, RPM, AppImage, Snap, Flatpak), including system/network requirements, installer flags and commands, post-install configuration (servers.json, overridden-settings.json), enterprise deployment scenarios (Group Policy, SCCM/Intune, MDM, Ansible, Docker), verification steps, troubleshooting, exit codes, and automation best practices

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 Silent deployments hop into view,
A guide so thorough, documentation new!
From Windows to Linux, each platform set right,
Unattended installs now work day and night! ✨
This rabbit cheers loud—installation's a breeze! 🚀

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title 'docs: Add silent installation guide for enterprise deployments' directly and clearly summarizes the main change—adding comprehensive documentation for silent installation targeting enterprise use cases.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment
• Commit unit tests in branch silent-installing

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[coderabbitai]

Actionable comments posted: 1

🤖 Fix all issues with AI agents

In `@docs/silent-installation.md`:
- Line 578: Change the heading text "#### Examples" to "### Examples" so the
markdown heading hierarchy is correct (it currently jumps from an h2 to h4);
locate the heading string "#### Examples" in the document and update it to "###
Examples" to restore proper h2→h3→h4 structure.

🧹 Nitpick comments (1)

docs/silent-installation.md (1)

657-684: Consider parameterizing version numbers in deployment examples.

The Ansible playbook hardcodes version "4.11.1" in URLs. While this makes the example concrete and copy-pasteable, consider adding a variable at the top for easier maintenance.

♻️ Optional parameterization approach

 - name: Install Rocket.Chat Desktop
   hosts: workstations
   become: yes
+  vars:
+    rocketchat_version: "4.11.1"
   tasks:
     - name: Install Rocket.Chat (Debian/Ubuntu)
       apt:
-        deb: 'https://github.com/RocketChat/Rocket.Chat.Electron/releases/download/4.11.1/rocketchat-4.11.1-linux-amd64.deb'
+        deb: 'https://github.com/RocketChat/Rocket.Chat.Electron/releases/download/{{ rocketchat_version }}/rocketchat-{{ rocketchat_version }}-linux-amd64.deb'
       when: ansible_os_family == "Debian"

     - name: Install Rocket.Chat (RHEL/Fedora)
       dnf:
-        name: 'https://github.com/RocketChat/Rocket.Chat.Electron/releases/download/4.11.1/rocketchat-4.11.1-linux-x86_64.rpm'
+        name: 'https://github.com/RocketChat/Rocket.Chat.Electron/releases/download/{{ rocketchat_version }}/rocketchat-{{ rocketchat_version }}-linux-x86_64.rpm'
         state: present
         disable_gpg_check: yes
       when: ansible_os_family == "RedHat"

[coderabbitai]

⚠️ Potential issue | 🟡 Minor

Fix heading level hierarchy.

The heading jumps from h2 (line 566) to h4 without an h3, violating markdown heading hierarchy. Change #### Examples to ### Examples.

📝 Proposed fix

-#### Examples
+### Examples

📝 Committable suggestion

‼️ IMPORTANT
Carefully review the code before committing. Ensure that it accurately replaces the highlighted code, contains no missing lines, and has no issues with indentation. Thoroughly test & benchmark the code to ensure it meets the requirements.

Suggested change

	#### Examples
	### Examples

🧰 Tools

🪛 markdownlint-cli2 (0.18.1)

578-578: Heading levels should only increment by one level at a time
Expected: h3; Actual: h4

(MD001, heading-increment)

🤖 Prompt for AI Agents

In `@docs/silent-installation.md` at line 578, Change the heading text "####
Examples" to "### Examples" so the markdown heading hierarchy is correct (it
currently jumps from an h2 to h4); locate the heading string "#### Examples" in
the document and update it to "### Examples" to restore proper h2→h3→h4
structure.