Update docs, bump deps

Author: radum

docker-compose.yml

@@ -39,7 +39,7 @@ services:
     restart: unless-stopped
   sitespeed.io:
     container_name: sitespeed.io
-    image: sitespeedio/sitespeed.io:17.8.1-plus1
+    image: sitespeedio/sitespeed.io:19.6.0-plus1
     command: -V
     shm_size: 2g
     volumes:
@@ -78,7 +78,7 @@ services:
       - ./k6/scripts:/scripts
   grafana:
     container_name: grafana
-    image: grafana/grafana:8.0.0
+    image: grafana/grafana:8.1.5
     hostname: grafana
     # build: ./grafana
     depends_on:

docs/perf-1-liners.md

@@ -2,6 +2,21 @@
 
 > Using various tools to get raw data or trigger certain actions.
 
+## General
+
+Log all link rel urls from a page in the dev tools console.
+
+```js
+const rels = ['preload', 'prefetch', 'preconnect', 'dns-prefetch', 'prerender', 'modulepreload']
+
+rels.forEach(element => {
+  const linkElements = document.querySelectorAll(`link[rel="${element}"]`)
+  const dot = linkElements.length > 0 ? '🟩' : '🟥'
+  console.log(`${dot} ${element}`)
+  linkElements.forEach(el => console.log(el))
+});
+```
+
 ## cURL
 
 ### Find the Time to First Byte Using Curl