update index.html
big update

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* 5ee266c make `this._ast` public as `this.ast`
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* 55898c8 make `this._lines` public as `this.lines`
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* de3f6fa Revert "make `this._lines` public as `this.lines`"
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* b481974 add more helpers
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* 36e2275 make `this._lines` public as `this.lines`
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* f76ea78 improve tokenizations for better customizations
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* cab6a54 clean code
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v 2ac35f6 improve directive @include