Update docs for spinner and pagination

[marcjulian]

PR Checklist

Please check if your PR fulfills the following requirements:

• [ ] The commit message follows our guidelines: https://github.com/goetzrobin/spartan/blob/main/CONTRIBUTING.md#-commit-message-guidelines
• [ ] Tests for the changes have been added (for bug fixes / features)
• [ ] Docs have been added / updated (for bug fixes / features)

PR Type

What kind of change does this PR introduce?

• [ ] Bugfix
• [ ] Feature
• [ ] Code style update (formatting, local variables)
• [ ] Refactoring (no functional changes, no api changes)
• [ ] Build related changes
• [ ] CI related changes
• [X] Documentation content changes
• [ ] Other... Please describe:

Which package are you modifying?

• [ ] accordion
• [ ] alert
• [ ] alert-dialog
• [ ] aspect-ratio
• [ ] avatar
• [ ] badge
• [ ] button
• [ ] calendar
• [ ] card
• [ ] checkbox
• [ ] collapsible
• [ ] combobox
• [ ] command
• [ ] context-menu
• [ ] data-table
• [ ] date-picker
• [ ] dialog
• [ ] dropdown-menu
• [ ] hover-card
• [ ] input
• [ ] label
• [ ] menubar
• [ ] navigation-menu
• [x] pagination
• [ ] popover
• [ ] progress
• [ ] radio-group
• [ ] scroll-area
• [ ] select
• [ ] separator
• [ ] sheet
• [ ] skeleton
• [ ] slider
• [x] spinner
• [ ] switch
• [ ] table
• [ ] tabs
• [ ] textarea
• [ ] toast
• [ ] toggle
• [ ] tooltip
• [ ] typography

What is the current behavior?

What is the new behavior?

Update meta data for spinner component page and remove unused code from pagination page. Add spinner to templates and update component roadmap count.

Does this PR introduce a breaking change?

• [ ] Yes
• [X] No

Other information