feat(home): add Role Manager card + fix ecosystem toggle on /role-manager - #247

Changed pages include:

• index.html - view
• 404.html - view
• canton.html - view
• community-contracts.html - view
• confidential-contracts.html - view
• contracts-cairo.html - view
• contracts-compact.html - view
• contracts-stylus.html - view
• contracts-sui.html - view
• contracts.html - view

There are more changes not included in the list