[openstreetmap/openstreetmap-website] Use strong_migrations (#2237)

[Andy Allan]

> Do we at least know if it has the sense to recognise when you are doing things (like creating an index) in the same migration that creates a table and not complain about them

Maybe the test suite is useful if you want to review this? Probably clearer than reading the code.

https://github.com/ankane/strong_migrations/blob/11391b500c62e8aa0bb8660c45be5c2f49ca4be0/test/strong_migrations_test.rb#L252

I haven't found any craziness in my other projects. If there ever was a conflict of opinions, then the 'safety_assured' wrapper could be used.

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