Removed site navigation from licenses/ and publicdomain/ on print

[nobodys-ghost]

Fixes

• Related to [Bug] HTML print layout looks bad #281 by @TimidRobot

Description

This pull request hides the site and in-page navigation from pages in licenses/ and publicdomain/ when printed. I've tested my changes in Firefox, Chrome, Opera, and Microsoft Edge.

Also see related Data pull request (PR):

• Add print media CSS cc-legal-tools-data#222

Technical details

I added a media query to hide the sitewide header and footer elements when printed to base.css.

Tests

To verify:

1. Compile the static site
2. Navigate to http://127.0.0.1:8006/licenses/list.en and go to any of the legal code or deed pages
3. Open the print dialog
4. Confirm the site wide header and footer, as well as the in page navigation (if originally present) are gone.

Screenshots

Before

Site Header

Site Footer

In page navigation

After

No site header

No site footer

No side navigation

Checklist

• My pull request has a descriptive title (not a vague title like Update index.md).
• My pull request targets the default branch of the repository (main or master).
• My commit messages follow best practices.
• My code follows the established code style of the repository.
• I added or updated 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

For the purposes of this DCO, "license" is equivalent to "license or public domain dedication," and "open source license" is equivalent to "open content license or public domain dedication."

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.

[TimidRobot]

This is definitely an improvement, thank you!