[FEAT] Implement X-Accel for downloading files

[rfranks-securenet]

Is this a new feature request?

• [X] I have searched the existing issues

Wanted change

Implement a location block within the nginx configuration to allow the use of X-Accel for downloading files. The configuration required is documented within the General page under Settings within ProjectSend, copied below:

X-Accel is a method available in nginx that allows the system to serve files directly, bypassing php and it's limitations. To configure it, you need to edit your server block and add the following code:

location /serve-file {
    internal;
    alias /app/www/public/upload/;
}

Reason for change

This takes the load off PHP for downloading files, speeding up the download, removing the overhead of passing it through PHP, and bypassing the limitations of downloading a file via PHP

Proposed code change

No response

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