NexT v8 Docs

[stevenjoezhang]

Previous Roadmap

https://github.com/theme-next/theme-next.org/issues/36 https://github.com/theme-next/theme-next.org/issues/88

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• [x] Added custom language support feature #253 doc?
• [ ] Assets in docs/theme-settings/ ?
• [x] Rename NexT Configuration to NexT Quick Start in getting-started? (44699d043018944e18008b4c9033d24af50acfeb)
• [x] Add menu.sitemap doc in docs/getting-started/ (44699d043018944e18008b4c9033d24af50acfeb)
• [x] Move Configuring Menu Items to theme-settings? (c3b965228cbd6b284caf4e7e7db7a8014998961f)
• [x] Docs for header: false in Front-matter (1f14e94038b195a16cec9466b24ead0197d94893)
• [x] Docs: alternative to kramed https://www.npmjs.com/package/hexo-renderer-kramed Since kramed itself is no longer maintained, using hexo-renderer-pandoc or hexo-renderer-marked instead would be a good choice. theme-next.org has been updated: https://github.com/theme-next/theme-next.org/commit/520c38d300f234f99928f2b7a445a208f7ab24de
• [x] Multilingual documentation (language_switcher) https://github.com/theme-next/hexo-theme-next/pull/1430#issuecomment-605856142, df0fe089936e70b5141a3a0bc236fab3e8383fe4
• [x] Docs for pandoc installation
• [x] Docs for server-side rendering plugins
• [x] Image resolution (tomorrow preview SVG, https://github.com/next-theme/theme-next-docs/commit/8abad20d8e2199900901bea0ae0d40c9b642326e)
• [x] Pin dependencies in package.json (from npm, b607ee6883d5e14cc683bc775b42df7008728c66, 50401c45820179311c3731af66ddc459c4d0c221)
• [x] Docs: rename the post meta text of comment count (https://github.com/theme-next/hexo-theme-next/pull/998#issuecomment-605606753, 8abad20d8e2199900901bea0ae0d40c9b642326e)
• [x] Docs: custom icon image (https://github.com/theme-next/hexo-theme-next/issues/1461, 342e332b309627d0e151e8d06ae54448fffe3363)
• [x] Docs: default page for sub-menu (https://github.com/next-theme/hexo-theme-next/issues/60, ea561e025e58d268b539e6479014bbf72d91223f)
• [ ] Docs: install theme as git submodule