How to set up .htaccess for subdomain hosted with yii2 web application?

Question

Yii

There is a working web application on Yii2. The task is to add a second site, how to configure .htaccess for this?
Second site is just static HTML

File structure
Yii2 files are located in public_html root
Second site files in /public_html/site2/index.html folder

.htaccess:

# Mod_Autoindex
<IfModule mod_autoindex.c>
    # Disable Indexes
    Options -Indexes
</IfModule>

# Mod_Rewrite
<IfModule mod_rewrite.c>
    Options +FollowSymlinks
    # Enable mod_rewrite
    RewriteEngine On
  RewriteBase /
    RewriteCond %{REQUEST_URI} ^(.*)$
    RewriteRule ^(.*)$ web/$1
</IfModule>