Update cheatsheets

nvim

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+---
+syntax: markdown
+tags: [tldr, common]
+source: https://github.com/tldr-pages/tldr.git
+---
+# nvim
+
+> Neovim, a programmer's text editor based on Vim, provides several modes for different kinds of text manipulation.
+> Pressing `i` in normal mode enters insert mode. `<Esc>` goes back to normal mode, which doesn't allow regular text insertion.
+> See also: `vim`, `vimtutor`, `vimdiff`.
+> More information: <https://neovim.io>.
+
+- Open a file:
+
+`nvim {{path/to/file}}`
+
+- Enter text editing mode (insert mode):
+
+`<Esc>i`
+
+- Copy ("yank") or cut ("delete") the current line (paste it with `P`):
+
+`<Esc>{{yy|dd}}`
+
+- Enter normal mode and undo the last operation:
+
+`<Esc>u`
+
+- Search for a pattern in the file (press `n`/`N` to go to next/previous match):
+
+`<Esc>/{{search_pattern}}<Enter>`
+
+- Perform a regular expression substitution in the whole file:
+
+`<Esc>:%s/{{regular_expression}}/{{replacement}}/g<Enter>`
+
+- Enter normal mode and save (write) the file, and quit:
+
+`<Esc>:wq<Enter>`
+
+- Quit without saving:
+
+`<Esc>:q!<Enter>`