Refactor Default Mission Impact Values into reusable include file

[Copilot]

• Create docs/_includes/default_mission_impact_values.md with the tip content
• Replace the inline tip in docs/howto/bootstrap/collect.md with the include statement
• Add the include to docs/reference/decision_points/mission_impact.md
• Add the include to docs/howto/gathering_info/mission_impact.md
• Fix link paths to use absolute URLs (starting with /) to work correctly when included from different locations

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Refactor default mission impact values in collect.md into an includable</issue_title>
<issue_description>Child of #522

• Refactor the Default Mission Impact Values tip from docs/howto/bootstrap/collect.md into an includable file in docs/_includes
• Replace the tip in collect.md with the included tip
• Include the tip to the decision point reference page docs/reference/decision_points/mission_impact.md
• Include the tip in the "gathering info" page for mission impact
  </issue_description>

<agent_instructions>This is very similar to the changes in PR #1010, follow those as an example.</agent_instructions>

Comments on the Issue (you are @copilot in this section)

Fixes #964

---

💡 You can make Copilot smarter by setting up custom instructions, customizing its development environment and configuring Model Context Protocol (MCP) servers. Learn more Copilot coding agent tips in the docs.

[Copilot]

Pull Request Overview

Refactors the "Default Mission Impact Values" tip from the bootstrap guide into a reusable include file to eliminate duplication and improve discoverability across the documentation.

• Created a shared include file for the Default Mission Impact Values tip
• Replaced inline content in the bootstrap guide with an include statement
• Added the tip to the Mission Impact decision point reference and gathering info pages

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 1 comment.

File	Description
docs/_includes/default_mission_impact_values.md	New include file containing the Default Mission Impact Values tip
docs/howto/bootstrap/collect.md	Replaced inline tip with include statement
docs/reference/decision_points/mission_impact.md	Added include for the tip after the gathering info section
docs/howto/gathering_info/mission_impact.md	Added include for the tip at the end of the document

---

_{Tip: Customize your code reviews with copilot-instructions.md. Create the file or learn how to get started.}

[ahouseholder]

@copilot link checker reports:

URL        `../../../reference/decision_points/mission_impact.md'
Name       `Mission Impact'
Parent URL file:///home/runner/work/SSVC/SSVC/site/howto/bootstrap/collect/index.html, line 4696, col 20
Real URL   file:///home/runner/work/SSVC/SSVC/site/reference/decision_points/mission_impact.md
Check time 0.000 seconds
Result     Error: URLError: <urlopen error [Errno 2] No such file or directory: '/home/runner/work/SSVC/SSVC/site/reference/decision_points/mission_impact.md'>

Note that we include these includable from various locations within the site, so we need a solution for included files that allows us to resolve included links no matter where the including file lives.

[Copilot]

@copilot link checker reports:

...

Fixed in commit a9c6f3a. Changed the links in the include file to use absolute paths (/reference/...) instead of relative paths (../../reference/...). This ensures the links resolve correctly when the include is used from different locations in the documentation.