[site] Headers for custom lang support accordingly TOC

tutorials/custom_language_support/annotator.md

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-title: Annotator
+title: 7. Annotator
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 Annotator helps highlight and annotate any code based on specific rules.

tutorials/custom_language_support/code_style_settings.md

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-title: Code Style Setting
+title: 16. Code Style Setting
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 ### 1. Define code style settings

tutorials/custom_language_support/commenter.md

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-title: Commenter
+title: 17. Commenter
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 A commenter allows user to comment the code at the cursor or selected code automatically via *⌘/*.

tutorials/custom_language_support/completion_contributor.md

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-title: Completion Contributor
+title: 9. Completion Contributor
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tutorials/custom_language_support/find_usages_provider.md

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-title: Find Usages Provider
+title: 11. Find Usages Provider
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 A find usage provider uses a word scanner to build an index of words present in every file.

tutorials/custom_language_support/folding_builder.md

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-title: Folding Builder
+title: 12. Folding Builder
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 A folding builder helps you to fold the code regions and replace it with specific text.

tutorials/custom_language_support/formatter.md

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-title: Formatter
+title: 15. Formatter
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 *A formatter allows to reformat the code automatically based on code style settings.*

tutorials/custom_language_support/go_to_symbol_contributor.md

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-title: Go To Symbol Contributor
+title: 13. Go To Symbol Contributor
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 *A go to symbol contributor helps user to navigate to any PSI element by it's name.*

tutorials/custom_language_support/grammar_and_parser.md

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-title: Grammar and Parser
+title: 3. Grammar and Parser
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 ### 1. Define a token type

tutorials/custom_language_support/language_and_filetype.md

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-title: Language and File Type
+title: 2. Language and File Type
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tutorials/custom_language_support/lexer_and_parser_definition.md

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-title: Lexer and Parser Definition
+title: 4. Lexer and Parser Definition
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 The lexer defines how the contents of a file is broken into tokens.

tutorials/custom_language_support/line_marker_provider.md

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-title: Line Marker Provider
+title: 8. Line Marker Provider
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 Line markers help to annotate any code with icons on the gutter.

tutorials/custom_language_support/prerequisites.md

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-title: Prerequisites
+title: 1. Prerequisites
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tutorials/custom_language_support/psi_helper_and_utilities.md

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-title: PSI Helpers and Utilities
+title: 6. PSI Helpers and Utilities
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tutorials/custom_language_support/quick_fix.md

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-title: Quick Fix
+title: 18. Quick Fix
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tutorials/custom_language_support/reference_contributor.md

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-title: Reference Contributor
+title: 10. Reference Contributor
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tutorials/custom_language_support/structure_view_factory.md

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-title: Structure View Factory
+title: 14. Structure View Factory
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tutorials/custom_language_support/syntax_highlighter_and_color_settings_page.md

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-title: Syntax Highlighter and Color Settings Page
+title: 5. Syntax Highlighter and Color Settings Page
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