ci: update docs step to have longer timeout

Author: nickofthyme

.buildkite/steps/docs.ts

@@ -14,6 +14,7 @@ export const docsStep = createStep<CustomCommandStep>(() => {
     ...commandStepDefaults,
     label: ':docusaurus: Build - Docs',
     key: 'build_docs',
+    timeout_in_minutes: 20,
     commands: ['npx ts-node .buildkite/scripts/steps/docs.ts'],
     env: {
       ECH_CHECK_ID: 'build_docs',