feat: improve .gitignore

[rakshitgondwal]

Description

Fixes #97

Added hydrophone to the .gitignore file.

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[rjsadow]

/ok-to-test
/lgtm
/approve

Thanks @rakshitgondwal! generally we would like to encourage the use of make build but certinally this is a good addition.

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[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: rakshitgondwal, rjsadow

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[rakshitgondwal]

Thank you for the merge!