fix: accordion block & global styling issues

[anuj-adobe]

• Accordion block DOM manipulation to not show white background during transition, matching the content image structure with original page to ensure similar effect.
• "Our Radar" Section vertical spacing matched with original page, in mobile view section bottom separator is removed, section separator top is different in mobile and tablet plus
• Global H2 font size base value matched with original page
• accordion list margin set to 0.
• Most Popular Section background gray color shows only for tablet and above

Content changes

1. Our Radar Section Metadata: Separator Bottom => Separator Bottom Tablet Plus
2. Most Popular Section Metadata:
Gray Background => Gray Background Tablet Plus

Fix #108

Test URLs:

• Before: https://main--infosys--aemsites.hlx.live/drafts/anuj/iki
• After: https://issue-108--infosys--aemsites.hlx.live/anuj/iki

[aem-code-sync[bot]]

Hello, I'm the AEM Code Sync Bot and I will run some actions to deploy your branch and validate page speed. In case there are problems, just click a checkbox below to rerun the respective action.

• [ ] Re-run PSI checks
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Commits

* [e75f77b](https://github.com/aemsites/infosys/commit/e75f77bfc6d3ae60b232d5ba7bc61604c2d317d9) :white_check_mark: (latest) * [97832fc](https://github.com/aemsites/infosys/commit/97832fcf4af87046f8420c5e1431de4d9b266e2e) :white_check_mark:

[aem-code-sync[bot]]

	Page	Scores	Audits	Google
:iphone:	/anuj/iki
:desktop_computer:	/anuj/iki