fix(deps): update nextra monorepo to ^3.0.15

[renovate]

This PR contains the following updates:

Package	Change	Age	Adoption	Passing	Confidence
nextra	^3.0.13 -> ^3.0.15
nextra-theme-docs	^3.0.13 -> ^3.0.15

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Release Notes

shuding/nextra (nextra)

v3.0.15

Compare Source

Patch Changes

• bd498c6: fix compatibility with Next.js 15.0.0-rc.1

v3.0.14

Compare Source

Patch Changes

• 6454938: update css selectors for code, use code.nextra-code

• 9794e9e: update package version range for @theguild/remark-mermaid to be at
  least ^0.1.3
  nextauthjs/next-auth#12029 (comment)

• 9794e9e: Fix frontMatter.sidebarTitle didn't affect without
  frontMatter.title set

  now priority for sidebar title is:

  1. title property from _meta file
  2. frontMatter.sidebarTitle
  3. frontMatter.title
  4. formatted with Title based on filename

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