[Free Trial] Update the log in / get started screen

[wzieba]

Description

In scope of this task we should match UI of the very first screen a user can see, to the design presented below:

[shiki]

@ThomazFB Note that we're changing the content of the home screen. Please see pecCkj-mB-p2#comment-227

[ThomazFB]

After discussing internally (p1679608787304799-slack-C02KUCFCSFP), we decided to keep the changes here to a bare minimum and just modify the view center text message and get started button while keeping the other login buttons text as it is.

CC: @shiki

[shiki]

Updating just the prologue was my original thought. Sorry that wasn't clear. :)