docs(gitbook): add type conversions group documentation

docs/SUMMARY.md

@@ -1,7 +1,8 @@
 # Table of contents
 
 * [📗 About](README.md)
-* [💻 Functions](functions.md)
+* [💻 Functions](functions/README.md)
+  * [Type Conversions](functions/type-conversions.md)
 * [🧦 Function Aliases](function-aliases.md)
 * [🚀 Roadmap to Sprout v1.0](roadmap-to-sprout-v1.0.md)
 * [Old documentation from sprig](old-documentation-from-sprig/README.md)

docs/functions/README.md

@@ -0,0 +1,32 @@
+---
+description: A documented page for all functions usable in the template with examples
+---
+
+# 💻 Functions
+
+{% hint style="info" %}
+This page is currently under construction, functions migrated to this page are deleted from individuals pages under the [Old documentation from sprig](../old-documentation-from-sprig/) section. Thanks for your comprehension :pray:
+{% endhint %}
+
+Every function is categorized into a group and may include a **'must'** version. This 'must' version utilizes the native error handling of Go templates to manage errors that occur within your method.
+
+### List of groups
+
+* [**Conversions**](../old-documentation-from-sprig/conversion.md): Utility functions are used to convert one type to another in your templates.
+* <mark style="color:red;">**Encoding**</mark>: Functions designed to handle the encoding and decoding of data formats.
+* <mark style="color:red;">**Filesystem**</mark>: Tools to interact with and manipulate the file system.
+* <mark style="color:red;">**Maps**</mark>: Functions to facilitate operations and manipulations on map data structures.
+* <mark style="color:red;">**Misc**</mark>: A collection of miscellaneous functions that do not fit into the other categories.
+* <mark style="color:red;">**Numeric**</mark>: Functions focused on numeric calculations and conversions
+* <mark style="color:red;">**Random**</mark>: Tools to generate random things.
+* <mark style="color:red;">**Regexp**</mark>: Functions that provide support for regular expression processing.
+* <mark style="color:red;">**Slices**</mark>: Utilities to manage and manipulate slices.
+* <mark style="color:red;">**Strings**</mark>: Functions dedicated to string manipulation and analysis.
+* <mark style="color:red;">**Time**</mark>: Tools to handle dates, times, and time-related calculations.
+
+### Must version
+
+The **Must** version of each function is essentially a safer variant that ensures error handling is integrated into the function's execution. When you use a function prefixed by `Must` (e.g., `MustEncode`, `MustConvert`), the template engine automatically checks for and handles any errors that might occur during the function's execution.&#x20;
+
+This is particularly useful in scenarios where failing silently is not an option, and you need immediate feedback if something goes wrong. Utilizing the **Must** versions helps to maintain the robustness and reliability of your template code.
+