Remove margins from button

[koppen]

In commit c2ff3ed we added a "missing" margin to the purple style button. We did so for consistencys sake, but the fact that the me-2 class was missing from one button seems to indicate that the margin is not an innate part of the button, and the other buttons solely have the margin classes because they need to look pretty in the documentation.

The purple button example at https://flowbite.com/docs/components/buttons/#default-button does not have an end margin, whereas the other buttons do, probably because it is the last button of the group - which means it is entirely coincidental and specific to that example.

Generally speaking, margins shouldn't be a part of each component. Leave it up to the consumer to add the whitespace around your components that you need them to.

[Copilot]

Pull Request Overview

This PR removes intrinsic margin classes (me-2 and mb-2) from all button component styles to improve component composability. The change follows the principle that components should not impose their own spacing, allowing consumers to control layout and spacing as needed.

• Removes me-2 and mb-2 margin classes from all button and pill button style definitions
• Updates demo files to use Tailwind utility classes (space-x-2, space-x-4) for proper spacing in examples
• Maintains visual consistency in documentation examples while making components more flexible

Reviewed Changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated no comments.

File	Description
app/components/flowbite/button.rb	Removes margin classes from all button style definitions
app/components/flowbite/button/pill.rb	Removes margin classes from all pill button style definitions
demo/test/components/previews/button_preview.rb	Adds space-x-2 to preview display classes for proper spacing
demo/app/views/pages/index.html.erb	Adds sm:space-x-4 for horizontal spacing between buttons

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