Investigate speeding up hugo command for Handbook workspace
MR: Pending
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## Description
Following up on conversations [here](https://gitlab.com/gitlab-com/content-sites/handbook/-/merge_requests/15148#note_2694101737), Handbook repo workspace running `hugo` command takes around 20 minutes to finish, and we would like to figure out ways for improving this.
Furthermore, currently we configured using 10GB for Handbook repo workspace, as `hugo` command would event use all those 10GB while processing (after finished, memory usage back to around 5GB). This might worth improving as well.
For reference, for Internal Handbook repo workspace, `hugo` command takes around 5 minutes to finish. https://gitlab.com/gitlab-com/content-sites/internal-handbook/-/merge_requests/7317#note_2693951626
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## Acceptance criteria
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## Implementation plan
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