Use html for tables

Parts of !12 (merged) with html tables instead of markdown tables because CommonMark that's used for generating the website does not support tables.

Also, plain <table> tags generated by, f.ex., GFM look extremely ugly without styling, and there's no way to add styling to those tables without breaking all the other HTML pages because our website is from 2005 and uses tables for all formatting.

commit d4516a58:

download: List the Android NDKs used for each version
You generally need to build your Android app with the same NDK version
that the gstreamer binaries were built with, so document it.

This time use HTML tables so we can control the styling and because
CMark doesn't support tables.

commit be6d068c:

download: Add ABI compatibility notes for Windows
People often have misconceptions regarding this, such as:

https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/386
https://gitlab.freedesktop.org/gstreamer/gstreamer/issues/387

People also need to know what CRT(s) each set of binary releases uses.
For example, there are different CRTs for debug vs release, and the
CRT can be linked statically or dynamically.

This time use tables so that we can control the styling and because
CMark doesn't support tables.