UPDATE: Documents reorganization and some additions

docs/src/features/error-types.md

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+---
+layout: doc
+outline: deep
+lang: en-US
+---
+
+# Error Types
+
+::: warning
+**Note:** This page is in construction 🚧
+:::
+
+When working with formulas, you may encounter these common errors:
+
+---
+
+### **`#ERROR!`**
+
+**Cause:** General formula issue, like syntax errors or invalid references.  
+**Fix:** Check the formula for mistakes or invalid cell references.
+
+---
+
+### **`#VALUE!`**
+
+**Cause:** Mismatched data types (e.g., text used where numbers are expected).  
+**Fix:** Ensure input types are correct; convert text to numbers if needed.
+
+---
+
+### **`#DIV/0!`**
+
+**Cause:** Division by zero or an empty cell.  
+**Fix:** Ensure the denominator isn’t zero or blank. Use `IF` to handle such cases:
+
+```
+=IF(B1=0, "N/A", A1/B1)
+```
+
+### **`#NAME?`**
+
+**Cause:** Unrecognized text in the formula (e.g., misspelled function names or undefined named ranges).  
+**Fix:** Correct spelling or define the missing name.
+
+### **`#REF!`**
+
+**Cause:** Invalid cell reference, often from deleting cells used in a formula.  
+**Fix:** Update the formula with correct references.
+
+### **`#NUM!`**
+
+**Cause:** Invalid numeric operation (e.g., calculating a square root of a negative number).  
+**Fix:** Adjust the formula to ensure valid numeric operations.
+
+### **`#N/A`**
+
+**Cause:** A value is not available, often in lookup functions like VLOOKUP.  
+**Fix:** Ensure the lookup value exists or use IFNA() to handle missing values:
+
+```
+=IFNA(VLOOKUP(A1, B1:C10, 2, FALSE), "Not Found")
+```
+
+### **`#NULL!`**
+
+**Cause:** Incorrect range operator in a formula (e.g., missing a colon between cell references).  
+**Fix:** Use correct range operators (e.g., A1:A10).
+
+
+### **`#CIRC!`**
+
+**Cause:** Circular reference.  
+**Fix:** Remove the circular reference.
+
+
+### **`#####`**
+
+**Cause:** The column isn’t wide enough to display the value.  
+**Fix:** Resize the column width to fit the content.

docs/src/features/importing-files.md

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----
-layout: doc
-outline: deep
-lang: en-US
----
-
-# Importing Files
-
-IronCalc supports direct importing of Excel files (.xlsx). Before proceeding, please ensure your file meets the required format.
-
-## How to Import Files
-
-You can upload files using one of the following methods:
-
-- **Drag and Drop**: Drag your `.xlsx` file and drop it into the designated upload area on the interface.
-- **Click to Upload**: Click on the central upload area and select your file from your device.
-
-::: info
-The maximum file size allowed is **1 MB**.
-:::

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.