Two suggested corrections

[jadudm]

Combining, because these two fixes are small.

• In _pages/integrations.md, "attain" -> "attaining" as a grammatical change.
• In _pages/project-setup.md, remove waffle.io link (service no longer exists).

I have made these changes in a fork and can submit a merge request if desired.

[ryanhofdotgov]

Thanks @jadudm!