[Feature Request]: Rewrite core.R in Python

[cicdguy]

Feature description

Ideally we want to use XML parsing to inject the HTML dropdown list in the navbar. This is a cleaner approach as compared to doing full text parsing as it leads to errors if styles/formatting change with different versions of pkgdown.

The core.R script needs to be rewritten with XML parsing instead of full text parsing. core.R contains all the core logic for creating the dropdown lists, where to insert the dropdowns and what files to modify.

Note that many programming languages can be used for this (Perl, Python, Awk, XMLLint etc) but given that Python contains xml as a standard library, that would be a preference.

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