chore: update keywords for SEO optimization

- Refactor keywords in cities_controller.rb
- Refactor keywords in weather_arts_controller.rb
- Refactor keywords in application.html.erb

This change improves the SEO of the application by updating
keywords to include 'ai' and 'ai web', which are more relevant
and likely to enhance search visibility. The previous keywords
were less optimized for current trends in AI-related searches.

app/controllers/cities_controller.rb

@@ -46,7 +46,7 @@ class CitiesController < ApplicationController
     set_meta_tags(
       title: @city.name,
       description: "Experience #{@city.name}'s weather through AI-generated art. Daily updates of weather conditions visualized through artificial intelligence.",
-      keywords: "#{@city.name}, #{@city.country.name}, ai art, ai weather, weather art, AI visualization",
+      keywords: "#{@city.name}, #{@city.country.name}, ai, ai web, ai art, ai weather, weather art, AI visualization",
       og: {
         image: @city.latest_weather_art&.image&.attached? ? url_for(@city.latest_weather_art.image) : nil
       }

app/controllers/weather_arts_controller.rb

@@ -17,7 +17,7 @@ class WeatherArtsController < ApplicationController
     set_meta_tags(
       title: "#{@city.name} Weather Art - #{@weather_art.weather_date.strftime('%B %d, %Y')}",
       description: "#{@city.name}'s weather visualized through AI art. #{@weather_art.description} at #{@weather_art.temperature}°C.",
-      keywords: "#{@city.name}, #{@city.country.name}, ai art, ai weather, weather art, AI visualization, #{@weather_art.description}",
+      keywords: "#{@city.name}, #{@city.country.name}, ai, ai web, ai art, ai weather, weather art, AI visualization, #{@weather_art.description}",
       og: {
         image: @weather_art.image.attached? ? url_for(@weather_art.image) : nil
       }

app/views/layouts/application.html.erb

@@ -11,7 +11,7 @@
           og: {
             site_name: 'TodayAIWeather',
             type: 'website',
-            keywords: "ai art, ai weather, weather art, AI visualization, today ai weather",
+            keywords: "ai, ai web, ai art, ai weather, weather art, AI visualization, today ai weather",
             url: request.original_url
           },
           alternate: {