docs: Add Bundle Graph view documentation

[Copilot]

• Download screenshot images from GitHub and save to images/bundlegraph/
• Update _manual/bundlegraph.md to reference local image paths

Original prompt

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This section details on the original issue you should resolve

<issue_title>Create Documentation for Bundle Graph</issue_title>
<issue_description>In PR bndtools/bnd#7106 we implemented a new View to display a Graph of bundles.

Please generate a web page for this at the same level as _manual/jareditor.md (rendered as https://bndtools.org/manual/jareditor.html) which is located under the secion "User Interface" in the left navbar.

As a screenshout you could use this:

The page should contain in user-friendly language the features of this graph view and a section for use-cases.</issue_description>

<agent_instructions>Please create a PR for this issue. </agent_instructions>

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

• Fixes Create Documentation for Bundle Graph #302

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