removed unwanted .hugo_build.lock file

[sourikghosh]

Signed-off-by: Sourik Ghosh sourikghosh31@gmail.com

What this PR does / why we need it: removes docs/.hugo_build.lock because that should not be tracked.

Special notes for your reviewer: fixes #1853

If applicable:

• [ ] this PR contains documentation
• [ ] this PR contains unit tests
• [ ] this PR has been tested for backwards compatibility

[netlify[bot]]

✔️ Deploy Preview for brigade-docs ready!

🔨 Explore the source changes: 622efc043a408bab5081eea4578fd4015ba906fb

🔍 Inspect the deploy log: https://app.netlify.com/sites/brigade-docs/deploys/621eef1ce448f100086158c9

😎 Browse the preview: https://deploy-preview-1855--brigade-docs.netlify.app

[sourikghosh]

ping reviewers @jdhuntington @mumoshu @spheromak @pawelprazak @krancour

[krancour]

Thank you for the contribution @sourikghosh!