feat(docs/meetup-2-guide): add register and badge customization actions

Signed-off-by: Noa Virellia <noa@requiem.garden>

src/content/docs/en/meetup-2-guide.mdx

@@ -4,7 +4,7 @@ description: 'Nix CN Meetup #2 is the second Nix-themed meetup in China. We aim
 sidebar:
     label: 'Meetup #2 Guide'
 ---
-
+import { LinkButton } from '@astrojs/starlight/components';
 import { Aside } from '@astrojs/starlight/components';
 
 <Aside type="caution">Translated by ChatGPT, not proofread.</Aside>
@@ -17,6 +17,13 @@ Nix CN Meetup #2 is the second Nix-themed gathering in China. We aim to bring to
 - **Venue:** Dong Xiayuan Building, Shanghai Jiao Tong University, Minhang Campus
   (800 Dongchuan Road, Minhang District, Shanghai)
 
+<LinkButton href='https://v.wjx.cn/vm/m9YRDuN.aspx' icon='external' iconPlacement='end'>
+    Register
+</LinkButton>
+<LinkButton href='#' icon='external' variant='secondary' iconPlacement='end'>
+    Name Badge Customization Request (Coming Soon)
+</LinkButton>
+
 ## Transportation Information
 
 ### Arriving in Shanghai