Some minor restructuring of the SASS files to reflect the architecture of USWDS

Add a brief README explaining best practices for styling
Add comment annotations to the top of each file that references the original USWDS documentation and source

scss/elements/_buttons.scss

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+/*
+ * Buttons
+ * @see https://designsystem.digital.gov/components/buttons/
+ * @source https://github.com/uswds/uswds/blob/develop/src/stylesheets/elements/_buttons.scss
+ */

scss/elements/_inputs.scss

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+/*
+ * Inputs
+ * @see https://designsystem.digital.gov/components/form-controls/
+ * @source https://github.com/uswds/uswds/blob/develop/src/stylesheets/elements/_inputs.scss
+ */
+
+from {
+  margin-bottom: 3rem;
+}
+
+select {
+  border-radius: 0;
+  -webkit-appearance: none;
+}
+
+.usa-date-input label {
+  margin-top: 0;
+}
+
+.input-label {
+  margin-top: 1rem;
+}
+
+.usa-fieldset-inputs {
+  margin-top: 2.25rem;
+
+  label:first-child {
+    padding-bottom: 0.5rem;
+  }
+}

scss/elements/_tables.scss

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+/*
+ * Tables
+ * @see https://designsystem.digital.gov/components/tables/
+ * @source https://github.com/uswds/uswds/blob/develop/src/stylesheets/elements/_table.scss
+ */

scss/elements/_typography.scss

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+/*
+ * Typography
+ * @see https://designsystem.digital.gov/components/typography/
+ * @source https://github.com/uswds/uswds/blob/develop/src/stylesheets/elements/_typography.scss
+ */
+
+h1, h2, h3, h4, h5, h6 {
+  font-family: $font-sans;
+
+  .usa-button {
+    position: relative;
+    bottom: 0.5rem;
+    left: 1rem;
+  }
+
+}
+
+h1 {
+  margin-top: 0.5em;
+}
+
+h2 {
+  margin-top: 0;
+}