Adding repodiving.md to inbound section of OSPO-guide

[isaac-rtc]

Problem

The OSPO Guide did not contain onboarding documentation for the repodive-tools toolkit, requiring users to rely on the standalone repository README to understand the available scripts, required dependencies, and usage workflows. The existing documentation also lacked additional context around how the tools fit together, their prerequisites, and supporting repository analysis techniques.

Solution

• Added a new Repo Diving Guide under the inbound section of the OSPO Guide.
• Ported and expanded the existing documentation from the repodive-tools repository into a structured onboarding guide.
• Added overview, prerequisites, usage, and notes sections for each available repodive script.
• Documented required dependencies (git, curl, jq, scc, and gource) with installation links and brief explanations of each tool.
• Added guidance for generating contributor reports and Gource logs, including the relationship between the generated artifacts and their intended use.
• Added navigation for the new Repo Diving Guide within the OSPO Guide inbound section.
• Clarified that the Gource workflow targets a configured GitHub organization and uses a GitHub Personal Access Token rather than a GitHub Enterprise Personal Access Token, matching the current implementation.

Result

Contributors now have a centralized onboarding resource within the OSPO Guide that explains the purpose of each repodive script, required setup, supporting dependencies, and common repository analysis workflows without needing to rely solely on the repodive-tools README.

Test Plan

• Built the OSPO Guide locally and verified the new page renders correctly.
• Verified the new page appears in the inbound navigation.
• Tested the repodive scripts to confirm the documented prerequisites and usage accurately reflect the current implementation.
• Verified all internal and external documentation links resolve correctly.

[decause-gov]

Great work here @isaac-rtc

If the documentation on repodive-tools itself does not reflect these changes, we should also update the docs over there to include this improved documentation. Nice job!

[isaac-rtc]

Great work here @isaac-rtc

If the documentation on repodive-tools itself does not reflect these changes, we should also update the docs over there to include this improved documentation. Nice job!

Thanks @decause-gov !

I'll merge this and then work on updating docs on the repodice-tools itself, I'll add you as reviewer once done!