Update 01_intro.ipynb - broken link to "A Mathematician's Lament" replaced with functional one

[menamerai]

Updated from the old broken link:

https://maa.org/external_archive/devlin/LockhartsLament.pdf

of the "A Mathematician's Lament" essay to a functional one:

https://maa.org/sites/default/files/pdf/devlin/LockhartsLament.pdf

solve the issue #618 .

[review-notebook-app[bot]]

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