Modify the summary section's margin/padding in case of anndata

[ke4]

Currently the summary section of the experiment page looks like this:

We need to remove the margin/padding on the top & left & right of the yellow box and align the text with the contents below.

On our last Team meeting we decided to replace the Avenger-styled icon to a simple A with a capital A in red-ish background. The tooltip text should be: Experiment with annotated data analysed by an external source. In another ticket we are also going to modify it and add a link to a help page that giving more details on Anndata to the user.

[ke4]

It should look like this:

[ke4]

The changes in the CSS to create the above layout:

• #main-content-area : margin-top: 0;
• #experimentDescription : padding: 0;
• .media-object stack-for-small anndata : padding: 0.9375rem;