Update logos and installer branding

[rtibbles]

Summary

• Updates logos
• Updates all installers to rebranded installers

Reviewer guidance

Check all logos to ensure that they are properly updated

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Testing checklist

• Contributor has fully tested the PR manually
• If there are any front-end changes, before/after screenshots are included
• Critical user journeys are covered by Gherkin stories
• Critical and brittle code paths are covered by unit tests

PR process

• PR has the correct target branch and milestone
• PR has 'needs review' or 'work-in-progress' label
• If PR is ready for review, a reviewer has been added. (Don't use 'Assignees')
• If this is an important user-facing change, PR or related issue has a 'changelog' label
• If this includes an internal dependency change, a link to the diff is provided

Reviewer checklist

• Automated test coverage is satisfactory
• PR is fully functional
• PR has been tested for accessibility regressions
• External dependency files were updated if necessary (yarn and pip)
• Documentation is updated
• Contributor is in AUTHORS.md

[github-actions]

Build Artifacts

Asset type	Download link
PEX file	kolibri-0.16.1a0.dev0_git.86.g299f42fc.pex
Windows Installer (EXE)	kolibri-0.16.1a0.dev0+git.86.g299f42fc-windows-setup-unsigned.exe
Debian Package	kolibri_0.16.1a0.dev0+git.86.g299f42fc-0ubuntu1_all.deb
Mac Installer (DMG)	kolibri-0.16.1a0.dev0+git.86.g299f42fc-0.4.1.dmg
Android Package (APK)	kolibri-0.16.1a0.dev0+git.86.g299f42fc-0.1.2-debug.apk
TAR file	kolibri-0.16.1a0.dev0+git.86.g299f42fc.tar.gz
WHL file	kolibri-0.16.1a0.dev0+git.86.g299f42fc-py2.py3-none-any.whl

[marcellamaki]

this looks good to me. code review cross-referenced installer update release version numbers as well as logo changes. expected behavior in mac ports confirmed in manual QA. smoke testing of local dev, pex, and macOS (including installer-related logo updates) all check out.

once checks pass should be good to go