docs: move the UI5 docs into the combined repo + finish the ABAP section

Migrates the full ui5-cc-spreadsheetimporter MkDocs documentation into this
repo under docs/ui5/ (index, all pages, images, stylesheets, overrides),
preserving every relative link/asset, and merges it with the ABAP backend
section into one MkDocs Material site:

- one combined nav: Home + UI5 Component (Frontend) + ABAP Importer (Backend)
- the UI5 theme reused for both (custom SAP-blue/Excel-green palette, logo,
  overrides, minify, full pymdownx extension set)
- CNAME (docs.spreadsheet-importer.com) carried over for the deploy step
- fixed a pre-existing broken relative link in the UI5 Pro install page
- the ABAP docs are self-contained: inline code snippets, no links into the
  (private) ABAP repos

Builds clean with 'mkdocs build --strict' (37 pages). Publishing to
docs.spreadsheet-importer.com is the next step.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>

Author: marianfoo

docs/CNAME

@@ -0,0 +1 @@
+docs.spreadsheet-importer.com

docs/index.md

@@ -43,6 +43,5 @@ can keep small imports in the browser and offload large ones to ABAP.
   [Integration Guide](abap/integration-guide.md).
 - **Extending the import?** See [Extension hooks](abap/integration-guide.md#extension-hooks-zif_ssi_hooks)
   (`ZIF_SSI_HOOKS`) and the runnable [Usage Cookbook](abap/usage-cookbook.md).
-- **Frontend component?** The full UI5 docs are at
-  [docs.spreadsheet-importer.com](https://docs.spreadsheet-importer.com/) — see the
-  [UI5 overview](ui5/index.md) here for the map.
+- **Frontend component?** See the [UI5 component docs](ui5/index.md) — getting started,
+  configuration, events, UPDATE, the CAP CDS plugin, and the full API reference.

docs/llms.txt

@@ -0,0 +1,35 @@
+# UI5 Spreadsheet Importer (ui5-cc-spreadsheetimporter)
+> UI5 component to import spreadsheet data into Fiori/UI5 apps, supporting bulk Excel uploads and optional CAP backend processing.
+
+**Notes**
+- Works with Fiori Elements and freestyle UI5 apps; backend-agnostic; see repo for license.
+- For large workbooks, prefer server-side processing with the CAP CDS Plugin.
+- Keep `manifest.json` version namespaces aligned with the deployed component.
+- Issues & updates: https://github.com/spreadsheetimporter/ui5-cc-spreadsheetimporter/issues
+
+## Quick Start
+- [Getting Started](https://docs.spreadsheet-importer.com/pages/GettingStarted/): Install via npm/CDN, set `resourceRoots` and `componentUsages`.
+- [Configuration](https://docs.spreadsheet-importer.com/pages/Configuration/): Reference of options with examples and defaults.
+- [API Reference](https://docs.spreadsheet-importer.com/pages/APIReference/): Component methods, events, and constructor options.
+
+## Core Features
+- [Button Control](https://docs.spreadsheet-importer.com/pages/Button/): Add the importer button and preload configuration.
+- [Events](https://docs.spreadsheet-importer.com/pages/Events/): Extension points for validation and data manipulation.
+- [Wizard](https://docs.spreadsheet-importer.com/pages/Wizard/): Guided step-by-step import process (v2.2.0+).
+
+## Deployment & Operations
+- [Central Deployment](https://docs.spreadsheet-importer.com/pages/CentralDeployment/): Recommended central deployment to ABAP/BTP systems.
+- [Update Operations](https://docs.spreadsheet-importer.com/pages/Update/): Update existing entities instead of creating new ones.
+- [Supported Versions](https://docs.spreadsheet-importer.com/pages/SupportVersions/): Compatible UI5 versions and tested scenarios.
+
+## Backend & Advanced
+- [CAP CDS Plugin](https://docs.spreadsheet-importer.com/pages/CdsPlugin/): Upload directly to CAP backend for scalability.
+- [Troubleshooting](https://docs.spreadsheet-importer.com/pages/Troubleshooting/): Common errors, diagnostics, debug flags.
+- [GitHub Repository](https://github.com/spreadsheetimporter/ui5-cc-spreadsheetimporter): Source, releases, issues.
+
+## Optional
+- [Checks & Validation](https://docs.spreadsheet-importer.com/pages/Checks/): Built-in data validation and error types.
+- [Table Selector](https://docs.spreadsheet-importer.com/pages/TableSelector/): Multi-table selection dialog for complex views.
+- [Spreadsheet Download](https://docs.spreadsheet-importer.com/pages/spreadsheetdownload/): Export backend data to spreadsheets.
+- [Development Guide](https://docs.spreadsheet-importer.com/pages/Development/GettingStarted/): Local dev setup and sample apps.
+- [Package on jsDelivr](https://www.jsdelivr.com/package/npm/ui5-cc-spreadsheetimporter): Public package and latest version.