[workers-observability] fix image path (#19709)

Co-authored-by: Rohin Lohe <[email protected]>

Author: rohinlohe

public/images/workers/observability/metrics-graphical-timepicker.png renamed to src/assets/images/workers/observability/metrics-graphical-timepicker.png

@@ -8,21 +8,21 @@ date: 2025-02-03T18:00:00Z
 
 We've revamped the [Workers Metrics dashboard](https://dash.cloudflare.com/?to=/:account/workers/services/view/:worker/production/metrics/). 
 
-![Workers Metrics dashboard](/public/images/workers/observability/workers-metrics.png)
+![Workers Metrics dashboard](~/assets/images/workers/observability/workers-metrics.png)
 
 Now you can easily compare metrics across Worker versions, understand the current state of a [gradual deployment](/workers/configuration/versions-and-deployments/gradual-deployments/), and review key Workers metrics in a single view. This new interface enables you to:
 
 - Drag-and-select using a graphical timepicker for precise metric selection. 
 
-![Workers Metrics graphical timepicker](/public/images/workers/observability/metrics-graphical-timepicker.png)
+![Workers Metrics graphical timepicker](~/assets/images/workers/observability/metrics-graphical-timepicker.png)
 
-- Use histograms that aggregate cumulative metrics, allowing you to bucket and compare rates over time.
+- Use histograms to visualize cumulative metrics, allowing you to bucket and compare rates over time.
 - Focus on Worker versions by directly interacting with the version numbers in the legend.
 
-![Workers Metrics legend selector](/public/images/workers/observability/metrics-legend-selector.png)
+![Workers Metrics legend selector](~/assets/images/workers/observability/metrics-legend-selector.png)
 
 - Monitor and compare active gradual deployments.
 - Track error rates across versions with grouping both by version and by invocation status.
-- Visualize how [Smart Placement](/workers/configuration/smart-placement/) improves request duration.
+- Measure how [Smart Placement](/workers/configuration/smart-placement/) improves request duration.
 
 Learn more about [metrics](/workers/observability/metrics-and-analytics).