chore: update README regarding `svelteConfig` (#1360) #4053

Job	Run time
lint	3m 30s
build	1m 18s
update-resources	39s
Test for Svelte v3 (ubuntu-latest, 18)	50s
Test for Svelte v3 (windows-latest, 18)	1m 51s
Test for Svelte v4 on Node.js: 18 OS: ubuntu-latest	49s
Test for Svelte v4 on Node.js: 20 OS: ubuntu-latest	47s
Test for Svelte v4 on Node.js: 22 OS: windows-latest	1m 32s
Test for Svelte v4 on Node.js: 22 OS: ubuntu-latest	46s
Test for Svelte v4 on Node.js: 18 OS: windows-latest	2m 42s
Test for ESLint 8 on Node.js: 20.x OS: ubuntu-latest	1m 25s
Test for ESLint 8 on Node.js: 18.x OS: ubuntu-latest	1m 41s
Test for Svelte v4 on Node.js: 20 OS: windows-latest	1m 28s
Test for ESLint 8 on Node.js: latest OS: ubuntu-latest	1m 21s
Test for ESLint 9 on Node.js: 18.x OS: ubuntu-latest	1m 31s
Test for ESLint 8 on Node.js: 22.x OS: ubuntu-latest	1m 26s
Test for ESLint 9 on Node.js: 20.x OS: ubuntu-latest	1m 21s
Test for ESLint 9 on Node.js: 22.x OS: ubuntu-latest	1m 23s
Test for ESLint 8 on Node.js: 20.x OS: windows-latest	2m 13s
Test for ESLint 9 on Node.js: 18.x OS: windows-latest	2m 3s
Test for ESLint 9 on Node.js: 22.x OS: windows-latest	2m 42s
Test for ESLint 9 on Node.js: latest OS: ubuntu-latest	1m 20s
Test for ESLint 8 on Node.js: 18.x OS: windows-latest	2m 10s
Test for ESLint 8 on Node.js: latest OS: windows-latest	1m 57s
Test for ESLint 9 on Node.js: 20.x OS: windows-latest	2m 40s
Test for ESLint 9 on Node.js: latest OS: windows-latest	2m 15s
Test for ESLint 8 on Node.js: 22.x OS: windows-latest	1m 58s
	45m 38s

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