Documentation updates for secure mode and SLZ support

[dayland]

This pull request primarily focuses on rebranding the Information Assistant accelerator to the Information Assistant copilot template. The changes span multiple documentation files and some frontend components to reflect this new branding. Below is a summary of the most important changes:

Rebranding and Documentation Updates:

• CONTRIBUTING.md: Updated the project name to "Information Assistant copilot template."
• README.md: Extensive rebranding from "Information Assistant accelerator" to "Information Assistant copilot template," including updates to deployment instructions, feature descriptions, and legal notices. [1] [2] [3] [4] [5] [6] [7] [8] [9] [10]
• SUPPORT.md: Updated support contact information to reflect the new project name.

Frontend Changes:

• index.html: Changed the title to "Information Assistant copilot template."
• Content.tsx: Updated text to reflect the new project name in the Supported file types section.

Version Update:

• version.json: Incremented the version from 1.1.2 to 1.2.

[lon-tierney]

One small issue on naming, otherwise looks good.