docs(blocks): complete block documentation migration cleanup

Move remaining block docs to block-integrations/ subdirectory:
- Delete old docs from docs/integrations/ root
- Add new docs under docs/integrations/block-integrations/
- Add guides/ directory with LLM and voice provider docs
- Update SUMMARY.md with correct navigation structure

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

docs/integrations/block-integrations/decoder_block.md

@@ -0,0 +1,32 @@
+# Text Decoder
+
+## What it is
+A tool that converts text with special characters into regular, readable text.
+
+## What it does
+It takes a string of text that contains escaped characters (like '\n' for new lines or '\"' for quotation marks) and converts them into their actual representations in the text.
+
+## How it works
+The Text Decoder looks at the input text and identifies special character sequences. It then replaces these sequences with their actual characters, making the text more readable and removing any escape characters.
+
+## Inputs
+| Input | Description |
+|-------|-------------|
+| Text | The text you want to decode, which may contain escaped characters like '\n' for new lines or '\"' for quotation marks |
+
+## Outputs
+| Output | Description |
+|--------|-------------|
+| Decoded Text | The text after processing, with all escape sequences converted to their actual characters |
+| Error | If there's a problem during the decoding process, an error message will be provided instead |
+
+## Possible use case
+Imagine you receive a text message that looks like this: "Hello\nWorld!\nThis is a \"quoted\" string." The Text Decoder can convert it into a more readable format:
+
+```
+Hello
+World!
+This is a "quoted" string.
+```
+
+This could be useful when working with data from various sources where text might be encoded to preserve special characters, such as when importing data from a file or receiving it from an API.