Fix regression: Display the Welcome page when there are no databases

[pavish]

Before #4072, we had this behaviour when there are no databases:

• Visiting '/' would display the welcome page
• Visiting '/databases' would simply show an empty state saying there are no databases

This behaviour was odd to begin with, and was a consequence of the redirection logic.

After #4072, we no longer have redirection based on number of databases, and the welcome page is no longer shown.

This PR fixes that and displays the Welcome content when there are no databases. Note that since this content is part of the home page, the background color is retained.

Screenshots

	Visting '/', the home page	Visting '/databases' - 'Manage databases' page
Before #4072
In #4072		N/A
In this PR		N/A

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the develop branch of the repository
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added tests for the changes I made (if applicable).
• I added or updated documentation (if applicable).
• I tried running the project locally and verified that there are no
  visible errors.

Developer Certificate of Origin

Developer Certificate of Origin

Developer Certificate of Origin
Version 1.1

Copyright (C) 2004, 2006 The Linux Foundation and its contributors.
1 Letterman Drive
Suite D4700
San Francisco, CA, 94129

Everyone is permitted to copy and distribute verbatim copies of this
license document, but changing it is not allowed.


Developer's Certificate of Origin 1.1

By making a contribution to this project, I certify that:

(a) The contribution was created in whole or in part by me and I
    have the right to submit it under the open source license
    indicated in the file; or

(b) The contribution is based upon previous work that, to the best
    of my knowledge, is covered under an appropriate open source
    license and I have the right under that license to submit that
    work with modifications, whether created in whole or in part
    by me, under the same open source license (unless I am
    permitted to submit under a different license), as indicated
    in the file; or

(c) The contribution was provided directly to me by some other
    person who certified (a), (b) or (c) and I have not modified
    it.

(d) I understand and agree that this project and the contribution
    are public and that a record of the contribution (including all
    personal information I submit with it, including my sign-off) is
    maintained indefinitely and may be redistributed consistent with
    this project or the open source license(s) involved.

[seancolsen]

Thanks for fixing this, @pavish.

I had been intending to clean this up as part of #4057, but you beat me to it. Wonderful!

Works great!

I added some commits to resolve merge conflicts and fix a lint warning.