fix: correct auto-generated guidelines links

[janhassel]

Addresses most cases from #5837

Currently, all auto-generated guideline links for components and patterns are leading to 404 pages as they…:

• use an uppercase first characters instead of lowercase
• add an unwanted "s" suffix

Before

https://pages.github.ibm.com/cdai-design/pal/Componentss/side-panel/usage

After

https://pages.github.ibm.com/cdai-design/pal/components/side-panel/usage

What did you change?

• Transform kind (Components | Patterns) to lowercase
• Remove unwanted "s" suffix

How did you test and verify your work?

Local storybook

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[matthewgallo]

Thanks @janhassel! 🎉

[davidmenendez]

woot. ty

[davidmenendez]

@matthewgallo i wanted to point out that this did fix some things, like AboutModal and Tearsheet, which were initially called out, but it looks like some of these urls are still broken. like for cards and datagrid. these may be special circumstances based on the gatsby url structure. so while i think this is merge ready and does help alleviate some problems it's not fixed entirely. just wanted to point that out 👍