Documentation title missing info

[ruudboon]

Currently all a lot of page titles are missing info.

<title>Phalcon Documentation - </title>

https://docs.phalcon.io/4.0/en/introduction

I would like the page title to contain info about the page for better SEO performance.
Can we do something like this:

<title>Introduction - Phalcon Documentation</title>

This should also be reflected in the social meta tags.

[sergeyklay]

@niden Could we add to the docs template keywords:

• title
• description
• keywords

and use these keywords in pages if they is defined, otherwise use defaults.

[niden]

This is already in v4. We will need to add some keywords on v3 also