Add rails_icons (Tabler) for SVG iconography

Vendors the Tabler outline/filled icon sets via rails_icons' sync
mechanism rather than a hand-rolled SVG set or a webfont -- this app
had no icon system of any kind before. Icons are committed like any
other static asset; re-syncing is only needed when adding an icon
that isn't vendored yet, via the new `make sync_icons` target.

1 files changed, 22 insertions, 0 deletions

diff --git a/app/assets/svg/icons/tabler/outline/variable-plus.svg b/app/assets/svg/icons/tabler/outline/variable-plus.svg
new file mode 100644
index 00000000..9e88a4d4
--- /dev/null
+++ b/app/assets/svg/icons/tabler/outline/variable-plus.svg
@@ -0,0 +1,22 @@
+<!--
+tags: [add, new, maths, mathematics, science, calculate, function, variable, plus, calculation]
+category: Math
+version: "1.89"
+unicode: "f36b"
+-->
+<svg
+  xmlns="http://www.w3.org/2000/svg"
+  width="24"
+  height="24"
+  viewBox="0 0 24 24"
+  fill="none"
+  stroke="currentColor"
+  stroke-width="2"
+  stroke-linecap="round"
+  stroke-linejoin="round"
+>
+  <path d="M5 4c-2.5 5 -2.5 10 0 16m14 -16c1.38 2.76 2 5.52 1.855 8.448m-11.855 -3.448h1c1 0 1 1 2.016 3.527c.785 1.972 .944 3.008 1.483 3.346" />
+  <path d="M8 16c1.5 0 3 -2 4 -3.5s2.5 -3.5 4 -3.5" />
+  <path d="M16 19h6" />
+  <path d="M19 16v6" />
+</svg>