add the 'html' option in the front end upload area

[minghanm]

Description

This PR updates the front-end file upload texts to include support for the HTML file format in addition to the existing formats (pdf, csv, txt, docx, xlsx).

Relevant context:
The change was made in the DragDrop component (src/components/DragDrop.js).
This addresses the feature request described in [issue #37 (https://github.com/harmonydata/harmony/issues/37).
The backend change for this feature is here: https://github.com/harmonydata/harmony/pull/72

Fixes #37

Type of change

• New feature (non-breaking change which adds functionality)

Testing

To verify the changes, the following tests were performed:

Verified the updated text is rendered correctly in the DragDrop component.

Test Configuration

• Library version: 1.0.1
• OS: macOS Sonoma 14.0 (Darwin Kernel 24.0.0, ARM64)
• Toolchain: npm v10.8.2, Node.js v18.20.5

Checklist

• My code follows the style guidelines of this project
• I have performed a self-review of my own code
• I have commented my code, particularly in hard-to-understand areas
• I have made corresponding changes to the documentation
• My changes generate no new warnings
• I have added tests that prove my fix is effective or that my feature works
• New and existing unit tests pass locally with my changes
• Any dependent changes have been merged and published in downstream modules
• I have checked my code and corrected any misspellings

[netlify]

👷 Deploy request for harmony-staging pending review.

Visit the deploys page to approve it

Name	Link
🔨 Latest commit	f2eb0b0