The purpose of Block Page

[cssmfc]

It is a simple landing page for anyone who want to redirect traffic from their website to a 3rd party.
.htaccess redirect
Apache
Redirect 301 / https://cssmfc.github.io/block/access-denied.html

where 301 is permanent redirect
/ This specifies that all requests to the root directory and any files or folders within it will be redirected.

Redirecting a Specific Directory

If you only want to redirect a specific directory and its contents:
Redirect 301 /old-directory/ https://cssmfc.github.io/block/access-denied.html

Using RewriteRule for More Flexibility

The RewriteRule directive offers more powerful pattern matching and redirection capabilities. Here's how you can use it for a general redirect:

RewriteEngine On
RewriteRule ^(.*)$ https://cssmfc.github.io/block/$1 [R=301,L]

RewriteEngine On: This line enables the rewrite engine. You only need this once in your .htaccess file.
RewriteRule ^(.*)$ https://www.your-new-website.com/$1 [R=301,L]:
^(.*)$: This is a regular expression that matches any characters (.) zero or more times (*) from the beginning (^) to the end ($) of the requested URL path. The parentheses capture the matched part.
https://cssmfc.github.io/block/$1: This is the target URL. $1 refers to the content captured by the parentheses in the RewriteRule (i.e., the entire original path). This ensures that if someone visits your-old-website.com/some/page.html, they will be redirected to https://www.your-new-website.com/some/page.html.
[R=301,L]: These are flags:
R=301: Specifies a permanent redirect (HTTP status code 301).
L: Stands for "Last". It tells the rewrite engine to stop processing any further rewrite rules once this one is matched.