Delete 25th anniversary image from FreeBSD website

[minsoochoo0122_proton.me]

Summary

Bugzilla Link Although It has been over 30 years since FreeBSD project started, there is still FreeBSD 25th anniversary logo on index.html

Test Plan

make run-local

[grahamperrin]

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=261058

Mid-way into a four-year-long twenty-fifth anniversary. Cheers!

…

To the left of the 25th anniversary badge:

"… more than thirty years. …"

Something began more than thirty years ago, however the thirtieth anniversary has not yet arrived.

[debdrup]

Yeah, let's hold off on celebrating the 30th anniversary until it actually happens, shall we? :)

Also, I'd recommend not tagging the doceng team in every review you create, since that only adds to the mail they receive, and phabricator (or some of the FreeBSD infrastructure surrounding it, I forget) knows which files need to have approval by them before the file can be changed, so it will add the automatically if needed.

[minsoochoo0122_proton.me]

In D34410#779715, @debdrup wrote:

Yeah, let's hold off on celebrating the 30th anniversary until it actually happens, shall we? :)

Also, I'd recommend not tagging the doceng team in every review you create, since that only adds to the mail they receive, and phabricator (or some of the FreeBSD infrastructure surrounding it, I forget) knows which files need to have approval by them before the file can be changed, so it will add the automatically if needed.

Okay, got that.

[carlavilla]

I'm gonna move forward this.