UPDATE: Documents reorganization and some additions

docs/src/features/unsupported-features.md

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+---
+layout: doc
+outline: deep
+lang: en-US
+---
+
+# Important Unsupported Features
+
+Although IronCalc is ready for use, it’s important to understand its current limitations. Below, we list the most significant missing features of a modern spreadsheet engine. If you can live without these features for now, IronCalc might be the product you’re looking for.
+
+## **Arrays and Array Formulas** <Badge type="info" text="Planned" />
+
+IronCalc currently does not implement arrays or array formulas. These are planned and are coming very soon, as they are the highest priority on the engine side.
+
+## **Name Manager** <Badge type="info" text="Planned" />
+
+While IronCalc supports importing and exporting defined names, it does not yet allow you to create, delete, or update them in the UI. This feature is expected to be implemented shortly.
+
+## **Only English Supported**
+
+The MVP version of IronCalc supports only the English language. However, version 1.0 will include support for three languages: **English**, **German**, and **Spanish**.
+
+## **No Autocomplete**
+
+Spreadsheet users are accustomed to autocompleting sequences (e.g., filling in `4, 5, 6` after `1, 2, 3`). This feature is not yet available in IronCalc but is on the roadmap for future updates.
+
+## **Charts** <Badge type="info" text="Not Planned for v1" />
+
+Although charts are an essential feature for any serious spreadsheet program, they are not planned for version 1.0. Adding chart support will become a high priority after the release of version 1.0.