Fix exposed private identifiers and hardcoded machine-specific paths

[Copilot]

Private Notion workspace IDs and machine-specific absolute paths (embedding username ignasxv) were committed to the public repository. Two auto-generated, machine-specific files were also being tracked unnecessarily.

Changes

Secrets / private identifiers

• claude/.claude/notion.md: Redacted private Notion database URL and data source ID → replaced with YOUR_DATABASE_ID / YOUR_DATA_SOURCE_ID placeholders

Hardcoded paths → portable equivalents

• fish/conf.d/turso.fish: /home/ignasxv/.turso → $HOME/.turso

Machine-specific files removed from tracking

• fish/.config/fish/fish_variables: Auto-generated fish universal variables file; contained hardcoded PATH entries with absolute username paths — added to .gitignore and untracked
• claude/.claude/plugins/known_marketplaces.json: Auto-generated by Claude tooling; stored absolute installLocation paths with username — added to .gitignore and untracked

Original prompt

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This section details on the original issue you should resolve

<issue_title>review</issue_title>
<issue_description>@copilot review any exposed secretd and potential danger in the repository or any bad practices</issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes review #3

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