docs: add context variables section to the footgun page

[daniel-lxs]

Add a guide to the newly added variables for the file-based custom system prompt

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Important

Adds documentation for context variables in custom system prompts to footgun-prompting.md.

• Documentation Update:
  • Adds a "Using Context Variables" section to footgun-prompting.md.
  • Describes special variables like {{mode}}, {{language}}, {{shell}}, {{operatingSystem}}, and {{workspace}}.
  • Provides an example of how to use these variables in custom system prompts.

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[ellipsis-dev]

Important

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1. docs/features/footgun-prompting.md:9

• Draft comment:
  The info block uses four colons (::::info) instead of the standard three (:::info). Please verify and adjust to maintain consistency with Docusaurus admonition syntax.
• Reason this comment was not posted:
  Comment was on unchanged code.

2. docs/features/footgun-prompting.md:9

• Draft comment:
  Admonition blocks in Docusaurus should start and end with triple colons (:::), not four. Please update '::::info' and corresponding closing '::::' to use three colons (:::info and :::).
• Reason this comment was not posted:
  Comment was on unchanged code.

3. docs/features/footgun-prompting.md:9

• Draft comment:
  The info block on line 9 starts with '::::info' but it should likely be ':::info' (using three colons) to adhere to the expected markdown syntax for admonitions.
• Reason this comment was not posted:
  Comment was on unchanged code.

Workflow ID: wflow_YJfWa2bNDYFGB1dl

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