docs: add installation and build guides from wiki to repo

README.md

@@ -16,7 +16,7 @@ Neovim is a project that seeks to aggressively refactor [Vim](https://www.vim.or
 - Simplify maintenance and encourage [contributions](CONTRIBUTING.md)
 - Split the work between multiple developers
 - Enable [advanced UIs] without modifications to the core
-- Maximize [extensibility](https://github.com/neovim/neovim/wiki/Plugin-UI-architecture)
+- Maximize [extensibility](https://github.com/neovim/neovim/wiki/Remote-UI-architecture)
 
 See the [Introduction](https://github.com/neovim/neovim/wiki/Introduction) wiki page and [Roadmap]
 for more information.
@@ -47,7 +47,7 @@ Pre-built packages for Windows, macOS, and Linux are found on the
 Install from source
 -------------------
 
-See the [Building Neovim](https://github.com/neovim/neovim/wiki/Building-Neovim) wiki page and [supported platforms](https://neovim.io/doc/user/support.html#supported-platforms) for details.
+See [BUILD.md](./BUILD.md) and [supported platforms](https://neovim.io/doc/user/support.html#supported-platforms) for details.
 
 The build is CMake-based, but a Makefile is provided as a convenience.
 After installing the dependencies, run the following command.
@@ -113,7 +113,7 @@ Apache 2.0 license, except for contributions copied from Vim (identified by the
 [nvim-news]: https://neovim.io/doc/user/news.html
 [Roadmap]: https://neovim.io/roadmap/
 [advanced UIs]: https://github.com/neovim/neovim/wiki/Related-projects#gui
-[Managed packages]: https://github.com/neovim/neovim/wiki/Installing-Neovim#install-from-package
+[Managed packages]: ./INSTALL.md#install-from-package
 [Debian]: https://packages.debian.org/testing/neovim
 [Ubuntu]: https://packages.ubuntu.com/search?keywords=neovim
 [Fedora]: https://packages.fedoraproject.org/pkgs/neovim/neovim/