Add Sets page, React Router navigation, collection export, and README

package-lock.json

@@ -10,8 +10,8 @@
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@@ -1138,6 +1138,19 @@
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@@ -2255,6 +2268,44 @@
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@@ -2265,16 +2316,6 @@
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@@ -2342,6 +2383,12 @@
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