Change blue links and text to dark grey (#555555)

Updated link colors in both CSS variables and Gradio theme to use
dark grey instead of blue/indigo for better visual consistency.

Co-authored-by: openhands <openhands@all-hands.dev>

app.py

@@ -138,11 +138,11 @@ theme = gr.themes.Base(
     color_accent='*primary_900',
     color_accent_soft='*neutral_200',
     color_accent_soft_dark='*neutral_800',
-    link_text_color='*secondary_900',
-    link_text_color_dark='*primary_900',
-    link_text_color_active_dark='*primary_600',
-    link_text_color_hover_dark='*primary_700',
-    link_text_color_visited_dark='*primary_600',
+    link_text_color='#555555',
+    link_text_color_dark='#aaaaaa',
+    link_text_color_active_dark='#888888',
+    link_text_color_hover_dark='#999999',
+    link_text_color_visited_dark='#888888',
     table_even_background_fill='*neutral_100',
     table_even_background_fill_dark='*neutral_800',
     button_primary_background_fill='*secondary_900',

content.py

@@ -29,7 +29,7 @@ INTRO_PARAGRAPH = """
 </p>
 
 <p>
-    For methodology details, see the <a href="/about" style="color: #6366F1; text-decoration: underline;">About</a> page.
+    For methodology details, see the <a href="/about" style="color: #555555; text-decoration: underline;">About</a> page.
 </p>
 """
 SCATTER_DISCLAIMER = """
@@ -239,7 +239,7 @@ css = """
 /* CSS Color Variables using All-Hands-AI color scheme */
 :root {
     --color-primary-accent: #FFE165; /* Yellow accent from All-Hands-AI */
-    --color-primary-link: #6366F1; /* Indigo/purple links */
+    --color-primary-link: #555555; /* Dark grey links */
     --color-neutral-light: #D4CABD; /* Tan placeholder */
     --color-background-light: #F1EAE0; /* Beige/cream background */
     --color-background-dark: #292A36; /* Dark gray */