apply indicator element on multiple websites

[jossef]

Support the registry websites such as npmjs and pypi.org. These sites need a custom UI component because we want to add this component as a static part of the page.

generic code to modify the content of selected websites (not *) to load and add the indicator element tag
e.g.

• npmjs.com (Apply static overlay section on npmjs.com #74)
• pypi.org (Apply static overlay section on pypi.org #75)
• reddit
• github issues comments
• twitter
• Implement on ChatGPT, Bard, New bing #86

[baruchiro]

One more thing to take into account is that on such "chat" GPT tools, the page is always updating with a new content, so we need to re-search for new packages every time the page is changed.

[fruch]

Also I would add some visual indicator on the plugin icon that the current site is supported.

[baruchiro]

DoD: Add to the README