HBASE-30005 Fix 1 high (flatted), 1 moderate (ajv) CVE in website dependencies

[PDavid]

Fix:

Executed npm audit fix to fix the vulnerable dependencies.

npm audit before:

# npm audit report

ajv  <6.14.0
Severity: moderate
ajv has ReDoS when using `$data` option - https://github.com/advisories/GHSA-2g4f-4pwh-qvx6
fix available via `npm audit fix`
node_modules/ajv

flatted  <3.4.0
Severity: high
flatted vulnerable to unbounded recursion DoS in parse() revive phase - https://github.com/advisories/GHSA-25h7-pfq9-p65f
fix available via `npm audit fix`
node_modules/flatted

2 vulnerabilities (1 moderate, 1 high)

To address all issues, run:
  npm audit fix

npm audit after:

found 0 vulnerabilities