docs: updating config.dev.toml to state NetworkMode env override - #2150

Changed pages include:

• index.html - view
• 404.html - view
• configuration/index.html - view
• contributing/index.html - view
• design/index.html - view
• es/index.html - view
• faq/index.html - view
• index.print.html - view
• install/index.html - view
• intro/index.html - view

There are more changes not included in the list