Move Neovim System Clipboard TIL to the Neovim section

neovim/allow-neovim-to-copy-paste-with-system-clipboard.md

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+# Allow Neovim To Copy/Paste With System Clipboard
+
+By default, Neovim uses some internal registers for managing the values that
+have been copied (`y`) and what should be pasted (`p`). These registers are
+independent from the system clipboard, so a value copied from the browser will
+not show up when you hit `p` in Neovim (or Vim).
+
+If you'd like to create a more seamless and cohesive copy/paste experience for
+yourself, you can instruct Neovim to read from and write to the system
+clipboard when copy/paste actions happen.
+
+This is accomplished with a `provider` that instructs Neovim to use the system
+clipboard directly for all copy/paste operations.
+
+```vimscript
+" ~/.vimrc
+set clipboard+=unnamedplus
+```
+
+Setting the `clipboard` option to include `unnamedplus` enables that provider
+"which transparently uses shell commands to communicate with the system
+clipboard or any other clipboard 'backend'." So, for Mac, `pbcopy` and
+`pbpaste`.
+
+See `:h provider-clipboard` for more details.