Content #
Markdown文件的标题格式如下：
Topic One
=========
some text about topic one.
it has multiple paragraphs.
Topic Two
=========
some text about topic two.
after the last.
inside section’s heading:
:onoremap ih :<c-u>execute "normal! ?^==\\+$\r:nohlsearch\rkvg_"<cr>
around section’s heading:
:onoremap ah :<c-u>execute "normal! ?^==\\+$\r:nohlsearch\rg_vk0"<cr>