Fix errors on noticeboard

[aa-dit-yuh]

Fix the following errors:

- ./_site/noticeboard/index.html
  *  1:14889: ERROR: Attribute class redefined (line 1)
  *  1:16791: ERROR: Unexpected end tag : img (line 1)
  *  1:19890: ERROR: Unexpected end tag : img (line 1)

[aa-dit-yuh]

@shubhika03 You have been assigned this issue.

[aa-dit-yuh]

@shubhika03 update?