* Delete old stack diagram

* Update first paragraph

* Update introduction.rst

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* Introduction graph optimization diagram

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* Introduction kernel to deep learning frameworks

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* Delete intro_kernel_to_fw.png

* Introduction kernel to frameworks with accent

* Update introduction.rst

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* Introduction multiplying kernels

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* Delete intro_kernel_to_fw_accent.png

* Introduction kernel explosion image

* Update introduction.rst

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* Update introduction.rst

* Edit introduction to be relevant to a wider audience

* Refine intro

* writing thru another draft

* Another batch of updates

* Tie the conclusion to the intro

* Clean up the doc

* First reviewer feedback done!

* fix typo

* fix typos

* Minor formatting fixes