Add links to dashboard boxes

[rdwebdesign]

What does this PR aim to accomplish?

• Add links to the 4 boxes on the top of dashboard;
• Rearrange the boxes colors.

How does this PR accomplish the above?

Adding the following links:

• Number of active clients (on Total queries box) ➔ link to network.php;
• Blocked queries box ➔ link to queries.php?forwarddest=blocked (blocked queries);
• Percentage box ➔ link to queries.php (all queries);
• Domains on Adlists box ➔ link to groups-adlists.php;

What documentation changes (if any) are needed to support this PR?

none

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2. I have commented my proposed changes within the code and I have tested my changes.
3. I am willing to help maintain this change if there are issues with it later.
4. It is compatible with the EUPL 1.2 license
5. I have squashed any insignificant commits. (git rebase)

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[yubiuser]

I like what I see. Three remarks:

1. There is a tooltip on "Total queries" and "Domains on adlist". This pops up when hovering over the new link. I think it should pop up when hovering over the boxes (old behavior) not the link.
2. I would rename "XX clients" to "XX active clients" because the number is only the number of active clients in the last 24h. It's confusing otherwise, because the network table might display way more clients.
3. I would change the link for "Percentage Blocked" to the query log in general, not only the blocked queries. As a percentage needs a reference value, displaying only the denominator is not very meaningful.

[rdwebdesign]

I don't agree with item 1:
the tooltip IS on the box. The link triggers the tooltip because it's part of the box.

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Edit:
OK. Changed: no more tooltips over the links (the rest of the box shows the tooltip).