fixing bug (issue #20): Corrected Navigation Links for Next and Previous section buttons

[SerpentSociety]

Updated the Next and previous button links in affected sections to point to the correct next section.

Note: Some sections are using content from the same page, so there is a small hiccup with navigation in /embed/crate/tutorial and /embed/html-embed/ sections. Due to constraints in VitePress, I couldn't address this particular issue in this fix.