[FIX] portal: nav in title

The commit fix an issue causing the portal navbar to overlap/inherit wrong style in customised websites.

The previous layout used to add the entire portal navbar inside an <h3>, causing inner elements to inherit the titles style.
According to WC3 standards, titles can have phrasing content only.
Titles reference > https://w3c.github.io/html-reference/h3.html
Phrasing content reference > https://w3c.github.io/html-reference/common-models.html#common.elem.phrasing

By chance this issue was not visible on runbot, but was severely affecting our website and probably clients ones too.
This commit wrap the portal navbar in a standard bootstrap navbar structure, fixing the title issue and provinding some imp. too:

- Search is now available for mobile
- Modules can inject a custom/botstrap class (eg. navbar-default) ot customize design if needed

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