[FIX] website: remove non-fictional number from templates

Steps:
- Go to Website
- Click "Go to Website"

Bug:
The default phone number on the website is not fictional and may cause
unwanted spam.

Explanation:
In North America, only 555-0100 through 555-0199 are specifically
reserved for fictional use.
> The industry also reserved a block of 100 numbers as fictitious,
> non-working numbers (555-0100 through 0199) for use by the
> entertainment and advertising industries.

Source: https://www.nationalnanpa.com/pdf/NRUF/ATIS-0300115.pdf



opw:2530388

closes odoo/odoo#71311

Signed-off-by: Nicolas Lempereur (nle) <nle@odoo.com>