Delete unused icons; add empty lines to svg files

app/views/shared/icons/_activity.svg

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\ No newline at end of file

app/views/shared/icons/_commits.svg

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-</svg>
\ No newline at end of file

app/views/shared/icons/_contributionanalytics.svg

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\ No newline at end of file

app/views/shared/icons/_delta.svg

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app/views/shared/icons/_files.svg

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app/views/shared/icons/_icon_play.svg

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-  </svg>
\ No newline at end of file
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app/views/shared/icons/_members.svg

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-    <desc>Created with Sketch.</desc>
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\ No newline at end of file

app/views/shared/icons/_milestones.svg

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-    <desc>Created with Sketch.</desc>
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-    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
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app/views/shared/icons/_mr.svg

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-    <title>Group</title>
-    <desc>Created with Sketch.</desc>
-    <defs></defs>
-    <g id="Page-1" stroke="none" stroke-width="1" fill="none" fill-rule="evenodd">
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\ No newline at end of file

app/views/shared/icons/_pipelines.svg

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\ No newline at end of file

app/views/shared/icons/_wiki.svg

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\ No newline at end of file