Migrate doc/ from Texy to Markdown

[JanTvrdik]

Summary

• Convert all 6 documentation files from Texy format (.texy) to standard Markdown (.md)
• Translate Texy-specific syntax: "text":url links, /-- \-- code blocks, [* image *] embeds, underline headings, .[h4] annotations
• No content changes — purely a format migration

Test plan

• Verify all .md files render correctly on GitHub
• Confirm internal cross-links between doc pages resolve properly
• Check that the image reference in plain-php.md displays correctly

[Copilot]

Pull request overview

Migrates the project documentation in doc/ from Texy-style markup to GitHub-renderable Markdown, updating headings, links, code fences, and image embeds.

Changes:

• Converted Texy-style headings and annotations to Markdown heading syntax across docs.
• Replaced Texy code blocks (/-- ... \--) with fenced Markdown code blocks (including language tags where applicable).
• Migrated Texy link/image syntax to standard Markdown links and images; replaced menu.texy with menu.md.

Reviewed changes

Copilot reviewed 7 out of 7 changed files in this pull request and generated no comments.

Show a summary per file

File	Description
doc/symfony-console.md	Converted headings and code blocks to Markdown.
doc/symfony-bundle.md	Converted headings, code fences (PHP/YAML), and internal link to Markdown.
doc/plain-php.md	Converted code fencing and image embed to Markdown.
doc/nette-extension.md	Converted headings, code fences, and external/internal links to Markdown.
doc/menu.texy	Removed legacy Texy menu.
doc/menu.md	Added Markdown menu with updated intra-doc links.
doc/default.md	Converted headings, rules, and code blocks to Markdown; updated link syntax.

Comments suppressed due to low confidence (3)

doc/nette-extension.md:12

• The fenced block is marked as yaml, but the example uses tab indentation. YAML disallows tabs for indentation, so readers copying this may get invalid YAML. Consider converting tabs to spaces, or change the fence language to something accurate for Nette config (e.g., neon/text).
  doc/nette-extension.md:36
• Same as above: this block is labeled yaml, but it contains tab-indented config (and placeholders) that won't validate as YAML. Either convert indentation to spaces (valid YAML) or switch the code fence language to match the intended format.
  doc/default.md:58
• Grammar: “Migrations can written as file …” is missing words and reads awkwardly. Consider rewriting (e.g., “Migrations can be written as files …”) to avoid confusing readers during the format migration.

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