feat: add a section introducing CTRL+A and CTRL+E shortcuts

[ameynert]

Closes #334

Adds a section 'Shortcuts: Moving to the start or end of a command' under 'Shortcut: Tab Completion' in episode 1 to give a brief demonstration of the CTRL+A and CTRL+E keyboard shortcuts for moving to the start/end of a command as it is being typed.

These shortcuts are likely to be heavily used by learners as they frequently need to edit commands, and will reduce frustration as the commands in the workshop get longer,

[github-actions]

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 md5sum.txt         |  2 +-
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⏱️ Updated at 2025-06-27 17:47:16 +0000

[TaylorKT]

Consider allowing the students to encounter the error by hitting enter?

[TaylorKT]

Looks good to me!