rename table of contents to keep the search results clean

docs/src/docPages/api/commands.md

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 # Commands
 
-## Table of Contents
+## toc
 
 ## Introduction
 The editor provides a ton of commands to programmtically add or change content or alter the selection. If you want to build your own editor you definitely want to learn more about them.

docs/src/docPages/api/editor.md

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 # Editor
 
-## Table of Contents
+## toc
 
 ## Introduction
 This class is a central building block of tiptap. It does most of the heavy lifting of creating a working  [ProseMirror](https://ProseMirror.net/) editor such as creating the [`EditorView`](https://ProseMirror.net/docs/ref/#view.EditorView), setting the initial [`EditorState`](https://ProseMirror.net/docs/ref/#state.Editor_State) and so on.

docs/src/docPages/api/events.md

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 # Events
 
-## Table of Contents
+## toc
 
 ## Introduction
 The editor fires a few different events that you can hook into. There are two ways to register event listeners:

docs/src/docPages/api/extensions.md

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 # Extensions
 
-## Table of Contents
+## toc
 
 ## Introduction
 Extensions are the way to add functionality to tiptap. By default tiptap comes bare, without any of them, but we have a long list of extensions that are ready to be used with tiptap.

docs/src/docPages/api/keyboard-shortcuts.md

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 # Keyboard Shortcuts
 
-## Table of Contents
+## toc
 
 ## Introduction
 Keyboard shortcuts may be strings like `'Shift-Control-Enter'`. Keys are based on the strings that can appear in `event.key`, concatenated with a `-`. There is a little tool called [keycode.info](https://keycode.info/), which shows the `event.key` interactively.

docs/src/docPages/api/schema.md

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 # Schema
 
-## Table of Contents
+## toc
 
 ## Introduction
 Unlike many other editors, tiptap is based on a [schema](https://prosemirror.net/docs/guide/#schema) that defines how your content is structured. That enables you to define the kind of nodes that may occur in the document, its attributes and the way they can be nested.