minor #33613 Minor updates in the new Welcome page (javiereguiluz)

This PR was merged into the 4.4 branch.

Discussion
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Minor updates in the new Welcome page

| Q             | A
| ------------- | ---
| Branch?       | 4.4
| Bug fix?      | no
| New feature?  | no
| Deprecations? | no
| Tickets       | -
| License       | MIT
| Doc PR        | -

After #33510 was merged, there were some concerns about the warning message in the "Welcome Page". It's too low on the page, so it's easy to oversee it.

So, in this PR we propose to make the warning message way more visible and other minor tweaks. This is how it'd look on a smartphone and on a desktop:

![welcome-page](https://user-images.githubusercontent.com/73419/65033926-4af4b500-d946-11e9-9955-a4da60a65762.png)

Commits
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4517319e53 Minor updates in the new Welcome page
This commit is contained in:
Fabien Potencier 2019-09-17 12:39:01 +02:00
commit 4c470a9f3f

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