Add comprehensive documentation for DMARQ, including user guides, deployment instructions, and feature descriptions

- Created main documentation index and user guide with sections on getting started, dashboard overview, managing domains, and reports.
- Added detailed deployment guide for Docker and manual installation.
- Included user-friendly explanations of DMARC, its benefits, and how to manage domains and reports.
- Implemented visual assets for dashboard, domains, IMAP, and reports.
- Established requirements for documentation build using MkDocs and Material theme.
- Integrated navigation structure for easy access to all documentation sections.

docs/readthedocs/assets/imgs/dashboard-icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#1A237E" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <rect x="3" y="3" width="18" height="18" rx="2" ry="2"></rect>
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+  <circle cx="15" cy="15" r="3"></circle>
+</svg>

docs/readthedocs/assets/imgs/domains-icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#1A237E" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <path d="M12 2a10 10 0 1 0 0 20 10 10 0 1 0 0-20z"></path>
+  <path d="M2 12h20"></path>
+  <path d="M12 2v20"></path>
+  <path d="M20 16.5a8 8 0 0 0-16 0"></path>
+  <path d="M4 7.5a8 8 0 0 1 16 0"></path>
+</svg>

docs/readthedocs/assets/imgs/imap-icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#1A237E" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <rect x="2" y="4" width="20" height="16" rx="2" ry="2"></rect>
+  <path d="M22 7l-8.97 5.7a1.94 1.94 0 0 1-2.06 0L2 7"></path>
+  <line x1="2" y1="12" x2="9" y2="12"></line>
+  <line x1="15" y1="12" x2="22" y2="12"></line>
+  <path d="M10 12a2 2 0 0 0 4 0"></path>
+</svg>

docs/readthedocs/assets/imgs/reports-icon.svg

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+<svg xmlns="http://www.w3.org/2000/svg" viewBox="0 0 24 24" fill="none" stroke="#1A237E" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
+  <path d="M14 2H6a2 2 0 0 0-2 2v16a2 2 0 0 0 2 2h12a2 2 0 0 0 2-2V8z"></path>
+  <polyline points="14 2 14 8 20 8"></polyline>
+  <line x1="16" y1="13" x2="8" y2="13"></line>
+  <line x1="16" y1="17" x2="8" y2="17"></line>
+  <polyline points="10 9 9 9 8 9"></polyline>
+</svg>