docs: Update Lit README.md

[liruifengv]

Changes

• Update Lit README.md

Testing

Docs

Before

After

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Latest commit: d8e9261

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[liruifengv]

I also changed a code snippet in the Chinese translation. withastro/docs#4125

Before:

```diff
import { defineConfig } from 'astro/config';
import vue from '@astrojs/vue';
import lit from '@astrojs/lit';

export default defineConfig({
-  integrations: [vue(), lit()]
+  integrations: [lit(), vue()]
});
```

After:

```js  del={7} ins={8}
// astro.config.mjs
import { defineConfig } from 'astro/config';
import vue from '@astrojs/vue';
import lit from '@astrojs/lit';

export default defineConfig({
  integrations: [vue(), lit()]
  integrations: [lit(), vue()]
});
```

But it seems that it shouldn't be changed that way in the README. I don't know what to do.

[delucis]

Thanks @liruifengv! I actually fixed this in #7985 but haven't updated docs with it yet (will happen today via our automatic CI PR).

I think for your translation PR that version with ins/del is great! But yes, we should stick to using the diff version in the README so it displays well on GitHub and on npm.