Fix pagination links to use correct /page/N/ URL format

[Copilot]

Pagination "Older" and "Newer" links were generating malformed URLs (e.g. /page2) instead of the correct /page/N/ format, causing navigation to 404.

Changes

• index.html: Added missing slashes around page numbers in both pagination link hrefs

- <a class="pagination-item older" href="{{ site.baseurl }}page{{paginator.next_page}}">Older</a>
+ <a class="pagination-item older" href="{{ site.baseurl }}page/{{paginator.next_page}}/">Older</a>

- <a class="pagination-item newer" href="{{ site.baseurl }}page{{paginator.previous_page}}">Newer</a>
+ <a class="pagination-item newer" href="{{ site.baseurl }}page/{{paginator.previous_page}}/">Newer</a>

The page 2 → page 1 "Newer" link (which resolves to /) is unchanged and remains correct.

Original prompt

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This section details on the original issue you should resolve

<issue_title>Fix the page links</issue_title>
<issue_description>When browsing the older and newer page links, these do not function correctly. Update these so these correctly increment or decrease the pages. Page 1 is '/', and all other pages are follow the /page/ format. </issue_description>

Comments on the Issue (you are @copilot in this section)

• Fixes Fix the page links #3

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