dillon1000/react

[Website] Add titles and labels to iframes and images on Community pages (#11041)

* [Website] Add titles and labels to iframes and images on Community pages

**what is the change?:**
- add titles to all iframes
- add alt tags to images
- add `aria-label` to some links which only have images as contents.

**why make this change?:**
Based on warnings thrown by aXe a11y audit of those pages

**test plan:**
Manual testing

**issue:**
None

* remove redundant alt tags