Revert "Next: Mega menu in app header"

[lukaszjedrasik]

Related Issues

closes #

Short Description and Why It's Useful

Screenshots of Visual Changes before/after (if There Are Any)

Which Environment This Relates To

Check your case. In case of any doubts please read about Release Cycle

• Test version (https://test.storefrontcloud.io) - this is a new feature or improvement for Vue Storefront. I've created branch from develop branch and want to merge it back to develop
• RC version (https://next.storefrontcloud.io) - this is a stabilisation fix for Release Candidate of Vue Storefront. I've created branch from release branch and want to merge it back to release
• Stable version (https://demo.storefrontcloud.io) - this is an important fix for current stable version. I've created branch from hotfix or master branch and want to merge it back to hotfix

Upgrade Notes and Changelog

• No upgrade steps required (100% backward compatibility and no breaking changes)
• I've updated the Upgrade notes and Changelog on how to port existing Vue Storefront sites with this new feature

IMPORTANT NOTICE - Remember to update CHANGELOG.md with description of your change

Contribution and Currently Important Rules Acceptance

• I read and followed contribution rules

[coveralls]

Pull Request Test Coverage Report for Build 463652707

• 0 of 0 changed or added relevant lines in 0 files are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.07%) to 94.172%

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Totals
Change from base Build 463466664:	-0.07%
Covered Lines:	620
Relevant Lines:	653

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 463652707

• 0 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage increased (+1.3%) to 95.504%

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Totals
Change from base Build 463466664:	1.3%
Covered Lines:	333
Relevant Lines:	341

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💛 - Coveralls

[coveralls]

Pull Request Test Coverage Report for Build 463652707

• 1 of 1 (100.0%) changed or added relevant line in 1 file are covered.
• No unchanged relevant lines lost coverage.
• Overall coverage decreased (-0.006%) to 94.241%

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Totals
Change from base Build 463466664:	-0.006%
Covered Lines:	1353
Relevant Lines:	1419

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💛 - Coveralls