Rename meilisearch_host to meilisearch_url

[AdoPi]

Hello :wave:

I think the name meilisearch_host is a little bit confusing and error prone as it is used for an URL and not a real hostname.

I've changed the name "host" to use "url" instead.

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• [ X] Does this PR fix an existing issue, or have you listed the changes applied in the PR description (and why they are needed)?
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[AdoPi]

Oops sorry I didn't understand, I'm going to change all the occurences

[bors[bot]]

Build succeeded:

• integration-tests (Rails 5.2 with Ruby 2.6)
• integration-tests (Rails 5.2 with Ruby 2.7)
• integration-tests (Rails 6.1 with Ruby 2.6)
• integration-tests (Rails 6.1 with Ruby 2.7)
• integration-tests (Rails 6.1 with Ruby 3.0)
• integration-tests (Rails 6.1 with Ruby 3.1)
• integration-tests (Rails 7 with Ruby 2.7)
• integration-tests (Rails 7 with Ruby 3.0)
• integration-tests (Rails 7 with Ruby 3.1)
• linter-check
• smoke-test

[brunoocasali]

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