Add retry button for error page

[Raidakarim]

Describe this pull request. Link to relevant GitHub issues, if any.

This PR includes issue #84 deliverables as detailed in the following:
Added a retry boolean variable in the RobotMotion.jsx file. This retry boolean is true only when “Robot has encountered an error” text appears. When retry boolean is true a Retry button appears in the error page. I placed this button in the latter 50% of the page's viewbox and made it vertically and horizontally centered in that part. I used yellow for this button’s color as this is meant for an unintended / erroneous situation. When this button is clicked, the current robot motion starts again from planning, just like what the footer's resume button does when the robot is paused.

UPDATES:

• Assigned default value to retry in the function definition
• Changed resumeCallback function onclick
• Placed 'Retry' button in the prior 50% of the page's viewbox

Explain how this pull request was tested, including but not limited to the below checkmarks.

This feature was tested in Ubuntu VM 22.04 chromium and firefox browser in landscape and portrait modes of smartphone, tablet, desktop monitor, and laptop. The retry button appeared as expected and re-started the current action when the retry button is clicked.

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[amalnanavati]

Overall, this looks good. Thank you for addressing this promptly!

I have a few in-line requests for changes, but once those are addressed this should be good to go.

[amalnanavati]

See requested changes. I did test it on my phone with the real robot and it works well.