perf: optimize the layout of some forms on mobile

[ruibaby]

before:

after:

/kind feature
/milestone 1.5.x
/cc @halo-dev/sig-halo-admin

fixes halo-dev/halo#1919

Signed-off-by: Ryan Wang [email protected]

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[guqing]

/lgtm

[JohnNiang]

/approve

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[f2c-ci-robot]

[APPROVALNOTIFIER] This PR is APPROVED

This pull-request has been approved by: JohnNiang

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[JohnNiang]

/cherrypick release-1.5

[halo-dev-bot]

@JohnNiang: new pull request created: #565

In response to this:

/cherrypick release-1.5

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