feat: make doc links dynamic

[dblythy]

Currently, the doc links are fixed. This can be changed by building them dynamically.

The file js/links could be served either here or on parseplatform.org.

Related: https://github.com/parse-community/parse-community.github.io/pull/49

Closes #932

[dblythy]

The one file used by both sites will create a more consistent docs link experience.

[dblythy]

We do #49 first, and then add a script tag pointing to the links file at parseplatform.org

[mtrezza]

Merged https://github.com/parse-community/parse-community.github.io/pull/49

[dblythy]

Cool, this is good to merge