Fix duplicate Instagram link in index.md

Removed a duplicate 'Instagram' link from social networks section.

Author: diegorusso

index.md

@@ -13,7 +13,7 @@ author_profile: true
 - :page_facing_up: My CV can be found [here](https://www.diegor.it/cv/)
 - :speaking_head: You can talk to me in Italian :it:, Spanish :argentina:, and English :uk:
 - :memo: I used to [blog](https://www.diegor.it/posts/) but I stopped many years ago. :hourglass:
-- :zap: I use some social networks: [Linkedin](https://www.linkedin.com/in/diegor/), [bsky](http://bsky.app/profile/diegor.it), [X](https://x.com/diegor), and [Instagram](https://www.instagram.com/diego.russ0/)
+- :zap: I use some social networks: [Linkedin](https://www.linkedin.com/in/diegor/), [bsky](http://bsky.app/profile/diegor.it), [X](https://x.com/diegor), and [Instagram](https://www.instagram.com/diegor.it)
 - :yin_yang: I practice Wing Chun
 - :male_sign: Pronouns: he/him/his