Update Hermes' Governance Overview Page

[0xLightt]

• Introduction to methods/ethos/standards
• Link to governance process page
• Link to severity page
• Link to each governance action page

[wenakita]

Hermes Governance Overview Page is included in issue #53 . In addition, that issue contains another page called "Severity" which identifies the 5 severity levels and their implications.

✅ Introduction to methods/ethos/standards
✅ Link to governance process page
✅Link to severity page
❌Link to each governance action page