Check if the "latest release" file is needed

[sprunk]

There is latest_release.json which is obsolete and refers to 105-1544:

spring/doc/site/_data/latest_release.json

Line 30 in 306b6df

"name": "spring_bar_{BAR105}105.1.1-1544-g058c8ea",

But the site homepage actually shows the correct release so this file probably isn't being used. Remove it if possible.