Bumps [junit](https://github.com/junit-team/junit4) from 4.11 to 4.13.1.
- [Release notes](https://github.com/junit-team/junit4/releases)
- [Changelog](https://github.com/junit-team/junit4/blob/main/doc/ReleaseNotes4.11.md)
- [Commits](https://github.com/junit-team/junit4/compare/r4.11...r4.13.1)

Signed-off-by: dependabot[bot] <support@github.com>

static/sass/about.sass
	-Offset the third parallax background-image, `#img-3`, from the
	top more.

static/sass/about.sass, templates/about.html
	-Embed our NYTM demo video in the about page, beneath the
	original demo video.
	-Change video `div`'s specifier from `#wrap` to `.video`.

README.md
	-Our README is mostly intended for developers; to point everyone
	else in the right direction, add links to our about page and
	demo video.

static/js/index.js
        -Author names in codelets' hidden metadata were delimited by
        two commas instead of one; fix.

static/js/index.js
        -The conditional in `queryServer()` that was meant to insert an
        error message for 0 search-results had an incorrect comparison.
        Fix.

Add:
        static/(sass/about.sass, js/about.js)
                -Convert `adjustVimeoDimensions()`, which created the
                fluid-dimensioned Vimeo video, to a pure CSS solution.

Add:
        templates/about.html. static/(sass/about.sass, js/about.js)
                -Embed our Vimeo video, and add the Javascript necessary to make
                it fluid-width.

Ref:
        templates/about.html
                -The file's indented formatting was completely mangled in a
                previous commit; reformat.

Fix:
        templates/docs.html
                -Remove gap between the line-number column and code-viewport
                boundary in the API usage sample.

Add:
        templates/developers.html
                -Update the developers page with an "under construction"
                message.

        static/sass/developers.sass
                -Add a bare-bones stylesheet for the developers page.

Fix:
        static/js/index.advanced-search-form.js
                -Clicking the "submit" button in the advanced-search form didn't
                actually populate the results div because of an incorrect call
                to `queryServer()` instead of `populateResults()`.

Add most of the styled documentation page.

Add:
        static/sass/_logo.sass
                -The `bitshift` logo visible on our home-page may likely end up on
                other pages; move all of its styling to a SASS partial.

        templates/docs.html
                -Add `bitshift` logo.

Add:
        templates/docs.html
                -Reorganize page structure into a nested-unordered-list tree,
                for the inherent indentation.
                -Add content to each section.

        static/sass/docs.sass
                -Add virtually all of the necessary styling for the docs page.

Add:
        templates/docs.html
                -Add a skeleton structure for the documentation page.
                -Add some content to certain sections.

Add:
        templates/index.html, static/(js/index.advanced-search-form.js,
        sass/index.sass)
                -Add a "submit" button to the advanced search form, with styling
                and appropriate callbacks.

Add:
        static/js/index.js
                -Fix the `No results found.` end-of-page error-message bug.

        static/sass/index.sass
                -Mod results anchor and hidden-information styling.

Add:
        static/js/index.advanced-search-form.js
                -Fix lack of drop-down autocompletion in new `language` fields.
                -Change the names displayed next to input fields to match those
                present in the sidebar.

Add:
        app.py, templates/layout.html, static/sass/main.sass
                -Remove footer's slide-up animation; the additional content
                displayed (a copyright statement) is superfluous.

Clean up some results-styling bugs.

Add:
        static/js/index.js
                -Introduce a maximum character length to each attribute field.

        static/sass/index.sass
                -Add `overflow: auto` only when hidden information is displayed.
                -Decrease the width of the code viewport on hover; move the
                hidden information less far right.

Add:
        templates/index.html, static/sass/index.sass,
        static/img/index/search_bar_magnifying_glass.png
                -Replace the magnifying-glass advanced-search icon with a simple
                textual button.

        static/(js/index.js, sass/index.sass)
                -Slightly modify the appearance of error messages; add message
                for no results.

Add:
        bitshift/assets.py, static/sass/404.sass
                -Add `syntax_highlight()` and style rules to perform syntax
                highlighting on 404 error messages; used in
                `templates/error404.html`.

        templates
                -Add a `Jinja` expression to select a random "404" message from
                a sequence.

Add:
        static/img/about/bio*.jpg
                -Scale bio images to a smaller size, from 500x500px to
                200x200px, as they were far larger than necessary for their
                dimensions on the about page.

Add:
        templates/about.html
                -Replace filler text with real biographies.
                -Make all images hyperlinks to our `GitHub`s.

        static/img/about/bio(1, 2, 3).jpg
                -Update biography images with our headshots.

Add:
        static/js/index.js
                -7f4cd92 didn't fully fix the incorrect `codelet` attribute
                names in `createResult()`; second attempt.

Add:
        static/js/index.js
                -Modify functions to add actual result codelets to the `results`
                column: redefine `populateResults()` as a wrapper for
                `loadMoreResults()`, introduce a `Deferred` return-type to
                `queryServer()`, and change some incorrect object field names
                (eg, "html_code", which should've been "code") in
                `createResult()`.

Fix:
        static/sass/index.sass
                -Allow codelet-scrolling, and modify result component widths.