Integrate javascript

[sei-vsarvepalli]

This PR has a few changes related to Explorer.

1. moves Policy Explorer to Explorer for consistency and better term usage that is less confusing or heavy
2. Refactors Javascript tools to be module pattern in JavaScript Immediately Invoked Function Expression (IIFE) Module Pattern

[Copilot]

Pull Request Overview

This PR refactors the SSVC Explorer tool by renaming it from "Policy Explorer" to "SSVC Explorer" for clearer terminology, and migrates JavaScript functionality from iframe-based architecture to a module pattern using JavaScript IIFE (Immediately Invoked Function Expression). The changes improve consistency in naming and modernize the JavaScript implementation approach.

Key changes:

• Renamed "Policy Explorer" to "SSVC Explorer" throughout documentation and navigation
• Replaced iframe-based implementation with inline HTML and JavaScript modules
• Added external JavaScript dependencies (jQuery and D3.js) for enhanced functionality

Reviewed Changes

Copilot reviewed 3 out of 4 changed files in this pull request and generated 1 comment.

File	Description
mkdocs.yml	Updates navigation title, removes unused documentation sections, and adds JavaScript dependencies
docs/tutorials/starting_points.md	Updates references from "SSVC Policy Explorer" to "SSVC Explorer"
docs/ssvc-explorer/index.md	Replaces iframe implementation with inline HTML form and popup interface

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[ahouseholder]

I think there's an inadvertent deletion in mkdocs.yml beyond the intended changes. Once that's corrected the rest of the PR seems fine to me.