Always need to keep things simply and maintainable

[CXwudi]

I think the hello world post that DoIt theme's maintainer HEIGE-PCloud written is a great example for hinting us that we need to keep things simple.

Because the simpler we have, the easier to adapt to different situations. For example, what if the DoIt theme is no longer maintaining... (Although I hope HEIGE-PCloud can always maintain this great theme)