Rename 'rewriting' into 'vocabulary'
Change the format of 'today.md'
Rename 'clean-code' into 'writing-code'

I want to write about every kind of coding practice in
'writing-code.md', not just about clean code. I want to
write about everything that could make me a better developer.
Add documents to acquire vocabulary
Clean up 'mlog'
Write some stuff in 'mlog'
Update 'today'
Update 'vocabulary'