doc: fixup blank lines in README

[skip ci]

Author: flavorjones

README.md

@@ -115,32 +115,19 @@ $ bin/rails tailwindcss:upgrade
   Running the upstream Tailwind CSS upgrader
          run    npx @tailwindcss/upgrade@next --force --config /home/user/myapp/config/tailwind.config.js from "."
 ≈ tailwindcss v4.0.0
-
 │ Searching for CSS files in the current directory and its subdirectories…
-
 │ ↳ Linked `./config/tailwind.config.js` to `./app/assets/stylesheets/application.tailwind.css`
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 │ Migrating JavaScript configuration files…
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 │ ↳ The configuration file at `./config/tailwind.config.js` could not be automatically migrated to the new CSS
 │   configuration format, so your CSS has been updated to load your existing configuration file.
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 │ Migrating templates…
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 │ ↳ Migrated templates for configuration file: `./config/tailwind.config.js`
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 │ Migrating stylesheets…
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 │ ↳ Migrated stylesheet: `./app/assets/stylesheets/application.tailwind.css`
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 │ ↳ No PostCSS config found, skipping migration.
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 │ Updating dependencies…
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 │ Could not detect a package manager. Please manually update `tailwindcss` to v4.
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 │ Verify the changes and commit them to your repository.
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   Strip Inter font CSS from application layout
         gsub    app/views/layouts/application.html.erb
   Compile initial Tailwind build