Delete unused images from the site and correct image formatting (#10691)

* Remove unused images

Signed-off-by: Fanit Kolchina <[email protected]>

* Delete icons file and correct image formatting

Signed-off-by: Fanit Kolchina <[email protected]>

* Heading formatting

Signed-off-by: Fanit Kolchina <[email protected]>

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Signed-off-by: Fanit Kolchina <[email protected]>
(cherry picked from commit 3b9f3f9)
Signed-off-by: github-actions[bot] <github-actions[bot]@users.noreply.github.com>

Author: github-actions[bot]