remove docs of removed components, simplify readd() example

[lajbel]

• Remove mention to children() and solid() components
• Simplify the readd() example

[slmjkdbtl]

this part is to have an example text with background which is made possible

[lajbel]

what do you mean? You want to change the example to be something like

const label = make([
    text("hi")
])

const background = add([
    rect(50, 50)
])

background.add(label)

[lajbel]

Any update @slmjkdbtl ?

[slmjkdbtl]

yeah something like

const label = make([
    text("hi")
])

const background = add([
    rect(label.width, label.height)
])

background.add(label)

which might be a more practical example