Small changes made while adding point source to new workflow

[AndrewRidden-Harper]

This PR has some small changes that I made while adding point sources to the new workflow (this PR)

[gemini-code-assist]

Summary of Changes

Hello @AndrewRidden-Harper, I'm Gemini Code Assist¹! I'm currently reviewing this pull request and will post my feedback shortly. In the meantime, here's a summary to help you and other reviewers quickly get up to speed!

This pull request introduces a couple of minor but important improvements to the source_modelling/gsf.py module. These changes primarily focus on improving the robustness of file output operations by ensuring necessary directories exist and updating an outdated documentation link, all in support of ongoing work to integrate point sources into a new workflow.

Highlights

• Documentation Update: Updated the documentation link within the gsf.py module's docstring. The old link was outdated or broken, and the new one points to the current GSF file format specification on the QuakeCore wiki.
• File System Robustness: Enhanced the write_gsf function to automatically create the parent directories for the output GSF file if they do not already exist. This prevents potential FileNotFoundError issues and makes the function more robust when writing files to new directory structures.

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[gemini-code-assist]

Code Review

This pull request introduces two small changes: updating a URL in a docstring and making the write_gsf function create the output directory if it doesn't exist. The changes are reasonable. My review includes one suggestion to document the new directory creation behavior in the function's docstring to make this side-effect clear to future users.

[lispandfound]

Yeah these seem pretty inconspicuous

[AndrewRidden-Harper]

@joelridden @lispandfound @sungeunbae This PR has been approved by @lispandfound, but it needs more approvals before it can be merged