docs: add variable substitution example#166
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Add an example demonstrating .env variable substitution:
- ${VAR} syntax for names with underscores
- $VAR syntax for simple alphanumeric names
- Composing values from multiple variables (e.g. DATABASE_URL)
- Single quotes preventing substitution
- Escaped dollar signs
Closes allan2#129
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Add an example demonstrating .env variable substitution:
Closes #129