Redesign domain search input field

[DL6ER]

What does this implement/fix?

Before

Now

Related issue or feature (if applicable): Fixes #2701

Pull request in docs with documentation (if applicable): N/A

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1. I have read and understood the contributors guide, as well as this entire template. I understand which branch to base my commits and Pull Requests against.
2. I have commented my proposed changes within the code.
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)

Checklist:

• The code change is tested and works locally.
• I based my code and PRs against the repositories developmental branch.
• I signed off all commits. Pi-hole enforces the DCO for all contributions
• I signed all my commits. Pi-hole requires signatures to verify authorship
• I have read the above and my PR is ready for review.

[rdwebdesign]

Now that you changed the design to use a single button with shorter text, you can remove these CSS rules:

web/style/pi-hole.css

Lines 565 to 577 in 938c6ef

	#domain-search-block {
	display: block;
	}
	#domain {
	margin: 5px 0;
	}
	#domain-search-block .input-group-btn {
	display: inline-block;
	}
	#domain-search-block .input-group-btn button {
	margin: 0 5px 0 0;
	border-radius: 3px;
	}

EDIT:
After out conversation, I added a commit to remove the unused CSS.

[PromoFaux]

Tested OK