Header changes, added robokop neo4j browser to developer tools

[Amaru333]

UI Consistency and Label Updates:

• Button and dropdown labels have been updated for clarity, such as changing "About Robokop" to "About ROBOKOP" and "ROBOKOP KG Browser" to "ROBOKOP KG Neo4j Browser" in the header dropdowns. [1] [2]
• The download section card header now reads "Releases and Download Options" instead of just "Releases", improving clarity for users.

Data Mapping and Display Improvements:

• Graph data mapping in Graph.tsx has been updated to use new property names (name, description, totalNodeCount, totalEdgeCount) instead of the previous ones (graph_name, graph_description, final_node_count, final_edge_count). This ensures that the displayed information matches the current data model and avoids missing or incorrect values.
• When graph descriptions are missing, a fallback ("No description available") is now shown, improving user experience.

Component Structure:

• The Grid styled component in Graph.tsx now uses double quotes for its tag name, aligning with the new quoting convention.

These changes collectively improve code consistency, UI clarity, and data accuracy across the application's header, graph listing, and graph download pages.This pull request primarily updates code style and improves clarity in the Header.tsx and Download.tsx components. The main changes are the consistent use of double quotes for imports and strings, minor UI label improvements, and some small content updates for clarity.

UI/UX improvements:

• Changed the About dropdown label from "About Robokop" to "About ROBOKOP" and updated the Explore dropdown item label from "ROBOKOP KG Browser" to "ROBOKOP KG Neo4j Browser" for clarity. [1] [2]
• Updated the card header in the downloads section to "Releases and Download Options" for better clarity.
• Added ROBOKOP KG Neo4j Browser card in Developer Tools

Minor refactoring:

• Simplified some arrow function formatting for dropdown menu open handlers in Header.tsx.

These changes are mostly stylistic and aimed at improving code readability and user interface clarity.
Closes RobokopU24/Feedback#280
Closes RobokopU24/Feedback#281