Link to bottomline/baseline image in README broken

[real-or-random]

The link to https://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.graPHIGS/doc/phigstrf/figures/afma5rbd.jpg is broken. The image is still archived at https://web.archive.org/web/20130719045906if_/http://publib.boulder.ibm.com/infocenter/pseries/v5r3/topic/com.ibm.aix.graPHIGS/doc/phigstrf/figures/afma5rbd.jpg

[thomasf]

I had a look at copying the image from wikipedia .

https://en.wikipedia.org/wiki/Typeface_anatomy#/media/File:Typography_Line_Terms.svg

The image itself is public domain but I don't know about the fonts used in the image that has their own license so we probably should not copy it into GPL software.

We can maybe link to it and hope that wikipedia keeps it around longer than IBM did.