📝 Improve screenshot

Author: Freed-Wu

.gitignore

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+/diff.html

.markdownlint.yaml

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+---
+MD033: false

scripts/generate-diff.html.vim

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+#!/usr/bin/env -S vi -u
+set runtimepath+=.
+filetype on
+edit examples/main.cpp
+Insights!
+augroup init
+  autocmd!
+  autocmd VimEnter * call s:init()
+augroup END
+
+function! s:init() abort
+  TOhtml
+  " delete the last blank line
+  $delete
+  saveas! diff.html
+  qall
+endfunction