Update README.md table of contents

The table of contents in the README.md file has been updated to reformat the section titles and add new subsections. This makes the details more consistent and increases the clarity of available information for readers.

README.md

@@ -35,14 +35,17 @@ specifications, making it invaluable in scenarios where data quality and consist
   - [GitHub Action](#github-action)
   - [Docker container](#docker-container)
   - [PHP binary](#php-binary)
-- [Schema definition](#schema-definition)
-  - [Full description of the schema](#full-description-of-the-schema)
-  - [Extra checks](#extra-checks)
+- [Schema Definition](#schema-definition)
+  - [Example Schema in YAML](#example-schema-in-yaml)
+  - [Full Schema Description](#full-schema-description)
+  - [Extra Checks](#extra-checks)
 - [Complete CLI Help Message](#complete-cli-help-message)
-- [Report examples](#report-examples)
+- [Report Examples](#report-examples)
 - [Benchmarks](#benchmarks)
-  - [Brief conclusions](#brief-conclusions)
-  - [Examples of CSV files](#examples-of-csv-files)
+  - [Profiles](#profiles)
+  - [Divisions](#divisions)
+  - [Brief Conclusions](#brief-conclusions)
+  - [Examples of CSV Files](#examples-of-csv-files)
   - [Run benchmark locally](#run-benchmark-locally)
 - [Disadvantages?](#disadvantages)
 - [Coming soon](#coming-soon)