Fix integration slugs

[XavierAgostini]

Proposed changes

• Adjusts catalog script to generate integration slug based on catalog name rather than display name
• there might be some stub files that need to be cleaned up

Related issues (optional)

Fixes #406

[sanscontext]

I think this needs to be google-ads-classic?

[sanscontext]

I did a spot check, and something's not quite right with the Google-ads-classic/adwords one, other than that this is alot better!

[sanscontext]

Hey @XavierAgostini , when I run make catalog on this branch, it's also renaming the sources. I think this is fine for now since we're not pulling much source metadata, but would it be difficult to add a separator so we can keep the destination and cloud-source renames separate?

[sanscontext]

Closing this out per discussion - we do want to keep the display-name the slugified part, and move docs to match a rename. I'm going to go through and make sure that all the correct things are doing the right stuff in the docs, then make sure that the links to docs, as explained in the Partner Portal, are linking to the right thing.