Add theme support, light theme, and edgeless light

sass/includes/base.sass

@@ -1,87 +0,0 @@
-@use "colors.sass" as c
-
-body
-  background-color: c.$bg-dark
-  color: c.$fg-main
-  font-family: "Bariol", sans-serif
-  font-size: 18px
-  margin: 0
-  padding: 0
-  // for footer alignment
-  min-height: 100vh
-  display: flex
-  flex-direction: column
-
-a
-  color: c.$link
-
-pre, code
-  font-size: 0.88em
-
-code
-  background: c.$bg-darker
-  padding: 3px 5px
-  border-radius: 4px
-
-input, select, button
-  font-family: inherit
-  font-size: 16px
-  min-width: 0px
-
-button
-  cursor: pointer
-
-::placeholder
-  color: #c4c4c4
-  opacity: 1
-
-// focus section
-
-:focus
-  outline: none
-
-:-moz-focusring
-  outline: none
-
-::-moz-focus-inner
-  border: 0
-
-select:-moz-focusring
-  color: transparent
-  text-shadow: 0 0 0 c.$fg-bright
-
-body.show-focus
-  a, select, button, input, video, summary
-    &:focus
-      outline: 2px dotted #ddd
-
-video
-  background-color: black
-
-details
-  background-color: c.$bg-accent-x
-  padding: 12px
-  border-radius: 8px
-
-  summary
-    cursor: pointer
-    line-height: 1
-    margin-bottom: 0
-    user-select: none
-    color: c.$fg-main
-
-  &[open] summary
-    margin-bottom: 16px
-
-table
-  background-color: c.$bg-darker
-
-table, td, th
-  border: 1px solid c.$edge-grey
-  border-collapse: collapse
-
-td, th
-  padding: 4px 8px
-
-thead, tr:nth-child(even)
- background-color: c.$bg-darkest