feat: change mastodon to twitter (#101)

Issue #98 

<img width="985" height="302" alt="Captura de pantalla 2026-02-17 a las
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src="https://github.com/user-attachments/assets/f74c1ba5-bd37-431c-9fc5-553e831e0fea"
/>

Author: itziarZG

src/i18n/sponsors/ca.ts

@@ -414,7 +414,7 @@ export const ca = {
     items: [
       { icon: '🦋', label: 'Bluesky', url: 'https://bsky.app/profile/es.pycon.org' },
       { icon: '🐙', label: 'GitHub', url: 'https://github.com/python-spain' },
-      { icon: '🐘', label: 'Mastodon', url: 'https://fosstodon.org/@pycones' },
+      { icon: '𝕏', label: '', url: 'https://x.com/PyConES' },
       { icon: '💼', label: 'LinkedIn', url: 'https://www.linkedin.com/company/pycones' },
       { icon: '📸', label: 'Instagram', url: 'https://www.instagram.com/pycon_es' },
     ],

src/i18n/sponsors/en.ts

@@ -414,7 +414,7 @@ export const en = {
     items: [
       { icon: '🦋', label: 'Bluesky', url: 'https://bsky.app/profile/es.pycon.org' },
       { icon: '🐙', label: 'GitHub', url: 'https://github.com/python-spain' },
-      { icon: '🐘', label: 'Mastodon', url: 'https://fosstodon.org/@pycones' },
+      { icon: '𝕏', label: '', url: 'https://x.com/PyConES' },
       { icon: '💼', label: 'LinkedIn', url: 'https://www.linkedin.com/company/pycones' },
       { icon: '📸', label: 'Instagram', url: 'https://www.instagram.com/pycon_es' },
     ],

src/i18n/sponsors/es.ts

@@ -414,7 +414,7 @@ export const es = {
     items: [
       { icon: '🦋', label: 'Bluesky', url: 'https://bsky.app/profile/es.pycon.org' },
       { icon: '🐙', label: 'GitHub', url: 'https://github.com/python-spain' },
-      { icon: '🐘', label: 'Mastodon', url: 'https://fosstodon.org/@pycones' },
+      { icon: '𝕏', label: '', url: 'https://x.com/PyConES' },
       { icon: '💼', label: 'LinkedIn', url: 'https://www.linkedin.com/company/pycones' },
       { icon: '📸', label: 'Instagram', url: 'https://www.instagram.com/pycon_es' },
     ],