website: Move google-site-verification to the static dir

There are many build failures with timeout on our ci, with the following
message:

Error: Error building site:
"/workspace/doc/website/content/en/google96eb5b100ed66487.html:1:1":
timed out initializing value. You may have a circular loop in a
shortcode, or your site may have resources that take longer to build
than the timeout limit in your Hugo config file. *** [build] Error
code 255

This is an attempt to fix that without increasing timeout, this way Hugo
won't handle these files anymore.

Structure before:

$ find website/public/ | grep google
website/public/google96eb5b100ed66487
website/public/google96eb5b100ed66487/index.html
website/public/google6bb24ed0b804d5e9
website/public/google6bb24ed0b804d5e9/index.html

After:

$ find website/public/ | grep google
website/public/google6bb24ed0b804d5e9.html
website/public/google96eb5b100ed66487.html

PR: 256367
Reported by: wosch