Revert "Add chart URL tool"

This was mistakenly applied twice.

This reverts commit ff0665c3d477993bf94e0d197e73e91c7d3fc103.
Fix handling of absolute staticDir paths
Fix label when metric starts with name
Eliminate NaN or infinite data points
Fix Printf without formatting directives
Document the label option
Remove undocumented legend option
Add label support
Minor formatting improvement
Add /chart.png path
Add until option
Error out instead of crashing when server isn't specified
Add date to labels for ranges >24 hours
go.mod: update module name
Implement &min=...
Expand README.md
Document port specification usage
Add example chart