replace _ with - in path names (for consistency)

[tshepang]

r? ghost

[BoxyUwU]

Is there a recommended style for mdbooks?

[tshepang]

I have not seen any

[BoxyUwU]

im not sure what my preference is of a-b vs a_b, regardless of what we do though we should docuemnt it somewhere and add a CI check so the consistency doesn't regress

[tshepang]

I wrote a tool to help with the conversion, but it's too limited to place here... I will make it better and add it to ci

[tshepang]

im not sure what my preference is of a-b vs a_b

there is a general preference for a-b in URLs