Remove debug JS error overlay from index and explore

[ionfwsrijan]

Problem

index.html ships a debug JS error overlay in production: global 'error' and 'unhandledrejection' listeners paint a fixed red/orange banner with the raw JS message, filename, and line number for every visitor. Any transient client-side error permanently obscures the page and leaks internal script paths. The identical overlay also exists in explore.html.

Fix

Remove the debug overlay <script> block from the of both src/templates/index.html and src/templates/explore.html. No replacement is needed — errors are already visible in the browser console.

Files changed

• src/templates/index.html
• src/templates/explore.html

Testing

• GET / and GET /explore return 200; rendered HTML no longer contains the error/unhandledrejection overlay script.
• Full suite: 522 passed, 19 pre-existing unrelated failures, 3 skipped.

Closes #1862

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