Update onion icons to reflect Tor Browser 9.5 release

description:

When browsing an Onion Service, Tor Browser displays different onion icons in the address bar indicating the security of the current webpage.

![Image of a green onion](/static/images/green-onion.png)

A green onion means:

- The Onion Service is served over HTTP, or HTTPS with a self-signed certificate.

![Image of an onion](/static/images/black-onion.png)

An onion means:

- The Onion Service is served over HTTP, or HTTPS with a CA-Issued certificate.

- The Onion Service is served over HTTPS with a Self-Signed certificate.

![Image of a green onion with a lock](/static/images/green-onion-with-lock.png)

A green onion with a lock means:

- The Onion Service is served over HTTPS with a CA-Issued certificate.

![Image of an onion with a red slash](/static/images/black-onion-with-red-slash.png)

An onion with a red slash means:

- The Onion Service is served with a script from an insecure URL.

![Image of a grey onion with a red slash](/static/images/grey-onion-with-red-slash.png)

A grey onion with a red slash means:

- The Onion Service is served over HTTPS with a self-signed or CA-Issued certificate.

- The webpage contains subresources served over HTTP.

![Image of an onion with a caution sign](/static/images/black-onion-with-caution.png)

An onion with caution sign means:

- The Onion Service is served over HTTPS with an expired Certificate

- The Onion Service is served over HTTPS with a wrong Domain

- The Onion Service is served with a mixed form over an insecure URL