docs(docs): add new problem documentation pages and source selector component

apps/docs/redirects.ts

@@ -29,6 +29,7 @@ export default [
   { from: "/71", to: "/stack/simplify-path" },
   { from: "/73", to: "/matrix-index-math/set-matrix-zeroes" },
   { from: "/74", to: "/binary-search/search-a-2d-matrix" },
+  { from: "/76", to: "/sliding-window/minimum-window-substring" },
   { from: "/78", to: "/backtracking/subsets" },
   { from: "/80", to: "/two-pointers/remove-duplicates-from-sorted-array-ii" },
   { from: "/84", to: "/monotonic-stack/largest-rectangle-in-histogram" },
@@ -61,6 +62,7 @@ export default [
   { from: "/211", to: "/trie/design-add-and-search-words-data-structure" },
   { from: "/215", to: "/heap-priority-queue/kth-largest-element-in-an-array" },
   { from: "/217", to: "/hash-table/contains-duplicate" },
+  { from: "/224", to: "/stack/basic-calculator" },
   { from: "/226", to: "/tree-dfs/invert-binary-tree" },
   { from: "/230", to: "/binary-search-tree/kth-smallest-element-in-a-bst" },
   { from: "/235", to: "/binary-search-tree/lowest-common-ancestor-of-a-binary-search-tree" },
@@ -89,6 +91,7 @@ export default [
   { from: "/739", to: "/monotonic-stack/daily-temperatures" },
   { from: "/853", to: "/monotonic-stack/car-fleet" },
   { from: "/875", to: "/binary-search/koko-eating-bananas" },
+  { from: "/901", to: "/monotonic-stack/online-stock-span" },
   { from: "/973", to: "/heap-priority-queue/k-closest-points-to-origin" },
   { from: "/974", to: "/prefix-sum/subarray-sums-divisible-by-k" },
   { from: "/977", to: "/two-pointers/squares-of-a-sorted-array" },