Add text bioviz.org about early access not being notarized

NF and AL reviewed his proposed changes. AL thinks they look great.

Some requests:

• She asks that the Mac text only appear on a Apple Computer. She recommends passing this along to KR to finish now that the design is done.
• Also, she requests that we add a line of text above the first item in the list: "The Early Access installer for Mac is not notarized. To install this unnotarized version, do the following steps."
• Please name the image files well so that it's obvious what page they belong to in the code base. Also add them to the "images" folder following the current pattern.
• Add a final step that says: "Follow the installer instructions from here."

Branch: https://bitbucket.org/nfreese/bioviz/branch/IGBF-3388

To test on Mac:

1. Fetch branch and view in browser (for example using Webstorm, ask Nowlan for additional details if unsure).
2. Check that the "Install Early Access IGB on Mac" section is visible.
3. Check that there are four numbered steps and three visible images.
4. Check for grammar/spelling issues.

To test on Windows:

1. Fetch branch and view in browser (for example using Webstorm, ask Nowlan for additional details if unsure).
2. Check that the "Install Early Access IGB on Mac" section is not visible.

Note: You can change your user agent (to make the browser think you are using Mac or Windows) via these instructions: https://www.makeuseof.com/tag/trick-websites-changing-user-agent-chrome/?newsletter_popup=1

Used the Chrome Developers tools to access a test page as a Mac, Windows, or Chrome OS computer.

Mac and Windows look great.

Chrome OS (I guess it is Linux?) showed something weird. Making a new ticket to improve how the page appears when an unrecognized user-agent loads the page.

Ready for PR.

Chrome OS is what Chromebooks have on them. According to wikipedia it is Linux based. We would need to test on a chromebook to see if the IGB linux installation would work.

Currently, we determine the user agent and then remove the d-none class (which hides the button) for that button. If the user agent doesn't match mac/windows/linux then all of the buttons remain hidden. We could add a fourth button/class so that if the user agent isn't mac/windows/linux we display some kind of message that we do not support their current operating system, or we only support mac/windows/linux.

Pull request: https://bitbucket.org/lorainelab/bioviz/pull-requests/120

Merged and ran playbooks to update main server https://bioviz.org. Ready for testing.

I missed a step where the first time the user right-clicks on the IGB installer icon and selects Open the result is a window saying that IGB cannot be started. Right-clicking again and selecting Open then results in the window giving the user the option to Open the installer. I have added an additional image and additional steps clarifying this.

Commit: https://bitbucket.org/nfreese/bioviz/commits/0d397c9079a20c12d6683f1b3709f7396fc24709
Pull request: https://bitbucket.org/lorainelab/bioviz/pull-requests/121

Merged and ran playbooks to update main server https://bioviz.org. Ready for testing.

Tested in windows and mac OS:

• "Install Early Access IGB on Mac" section is not visible for windows OS. on the other hand,
  MAC shows "Install Early Access IGB on Mac" which includes necessary steps for installation.
• I haven't seen any grammar/spelling issues in the installation steps, especially for MAC-OS.