Remove Settings and Setup pages along with their tests and related API services

- Deleted Settings.tsx and Setup.tsx pages, which included functionality for changing passwords and setting up an admin account.
- Removed associated test files for Setup page.
- Eliminated API service definitions related to proxy hosts, remote servers, import functionality, and health checks.
- Cleaned up mock data and test setup files.
- Removed configuration files for TypeScript, Vite, and Tailwind CSS.
- Deleted scripts for testing coverage, release management, Dockerfile validation, and Python compilation checks.
- Removed Sourcery pre-commit wrapper script.

frontend/src/api/certificates.ts

@@ -1,13 +0,0 @@
-import client from './client'
-
-export interface Certificate {
-  domain: string
-  issuer: string
-  expires_at: string
-  status: 'valid' | 'expiring' | 'expired'
-}
-
-export async function getCertificates(): Promise<Certificate[]> {
-  const response = await client.get<Certificate[]>('/certificates')
-  return response.data
-}