Refactor Members Directory and Newsletter Archive styles to use new color palette

- Updated color classes in MembersDirectory.js to use new color variables for borders, backgrounds, and text.
- Enhanced visual consistency by replacing hardcoded colors with Tailwind CSS color utilities.
- Modified NewsletterArchive.js to align with the new design system, ensuring a cohesive look across components.
- Added new color variables in tailwind.config.js for better maintainability and scalability.

.crossnote/config.js

@@ -0,0 +1,15 @@
+({
+  katexConfig: {
+  "macros": {}
+},
+  
+  mathjaxConfig: {
+  "tex": {},
+  "options": {},
+  "loader": {}
+},
+  
+  mermaidConfig: {
+  "startOnLoad": false
+},
+})