Place this .htaccess file in the root of your site. It does a couple of things: redirect http and www to https; serve site from a specific folder; and trim .html extension from URLs.

.htaccess file for static HTML sites

RewriteEngine On

# Redirect http:// and www. to https://
RewriteCond %{HTTPS} off [OR]
RewriteCond %{HTTP_HOST} ^www\.example\.com [NC]
RewriteRule (.*) https://example.com/$1 [L,R=301]

# If the host is "example.com", serve site content from /dist folder
 RewriteCond %{HTTP_HOST} ^example.com$ [NC]
# Then rewrite any request to /folder
 RewriteRule ^((?!dist).*)$ /dist/$1 [NC,L]
# Disable Automatic Directory detection
 DirectorySlash Off

# Trim .html extension from URL
RewriteCond %{THE_REQUEST} /([^.]+)\.html [NC]
RewriteRule ^ /%1 [NC,L,R]

RewriteCond %{REQUEST_FILENAME}.html -f
RewriteRule ^ %{REQUEST_URI}.html [NC,L]