High priority screen reader accessibility issues

[peterychang]

Reference spreadsheet: https://microsoft.sharepoint.com/:x:/t/AIRAccessibilityMetrics/EUKpsd8MzCJNmjkEegC3Y7sBTkiccRpyb21CUVIGXFNM4w?e=Q85tsc&CID=32e3a4f7-b13e-3241-96bd-e728ef558053

Issues:

• (1) Screen reader is not announcing position information for links.
• (7) Screen reader does not provide complete information on code.
• (8) "Screen reader is not announcing 'Copied' information after activating 'Copy to clipboard'."
• (13) Screen reader is not announcing ‘color changed to...’ information while activating the ‘Color mode’ button
• (22) Screen reader is not announcing ‘(‘, ‘)’, ‘{‘, ‘}’ braces information while navigating in the code.
• (24) Visible and acessible name is different for 'Discover and create your own' link control.
• (31) Screen reader is not announcing associated label ‘Tutorial, Advanced and More’ information, when focus lands on list items present in left pane.
• (36) Unnecessary screen reader announcing tooltip information.
• (40) Visible name and screen reader announcement is different for PyPI version & Downloads control.
• (41) Graphic image name is not descriptive.
• (53) Visible and acessible name is different for 'Travel planning', 'computer research' and 'Literature review' in Examples page
• (57) On this page' text is not defined under heading.
• (58) Screen reader is not announcing 'Current' state information when focus lands on selected pagein 'On this page' section.
• (59) Name property is not defined on control 'Cookbook'.