3 new icons: circle-letter-v, hexagon-letter-v, square-letter-v

Renamed icons:
- `circle-a` renamed to `circle-letter-a`
- `circle-b` renamed to `circle-letter-b`
- `circle-c` renamed to `circle-letter-c`
- `circle-d` renamed to `circle-letter-d`
- `circle-e` renamed to `circle-letter-e`
- `circle-f` renamed to `circle-letter-f`
- `circle-g` renamed to `circle-letter-g`
- `circle-h` renamed to `circle-letter-h`
- `circle-i` renamed to `circle-letter-i`
- `circle-j` renamed to `circle-letter-j`
- `circle-k` renamed to `circle-letter-k`
- `circle-l` renamed to `circle-letter-l`
- `circle-m` renamed to `circle-letter-m`
- `circle-n` renamed to `circle-letter-n`
- `circle-o` renamed to `circle-letter-o`
- `circle-p` renamed to `circle-letter-p`
- `circle-q` renamed to `circle-letter-q`
- `circle-r` renamed to `circle-letter-r`
- `circle-s` renamed to `circle-letter-s`
- `circle-t` renamed to `circle-letter-t`
- `circle-u` renamed to `circle-letter-u`
- `circle-w` renamed to `circle-letter-w`
- `circle-x` renamed to `circle-letter-x`
- `circle-y` renamed to `circle-letter-y`
- `circle-z` renamed to `circle-letter-z`
- `circle-0` renamed to `circle-number-0`
- `circle-1` renamed to `circle-number-1`
- `circle-2` renamed to `circle-number-2`
- `circle-3` renamed to `circle-number-3`
- `circle-4` renamed to `circle-number-4`
- `circle-5` renamed to `circle-number-5`
- `circle-6` renamed to `circle-number-6`
- `circle-7` renamed to `circle-number-7`
- `circle-8` renamed to `circle-number-8`
- `circle-9` renamed to `circle-number-9`
- `square-a` renamed to `square-letter-a`
- `square-b` renamed to `square-letter-b`
- `square-c` renamed to `square-letter-c`
- `square-d` renamed to `square-letter-d`
- `square-e` renamed to `square-letter-e`
- `square-f` renamed to `square-letter-f`
- `square-g` renamed to `square-letter-g`
- `square-h` renamed to `square-letter-h`
- `square-i` renamed to `square-letter-i`
- `square-j` renamed to `square-letter-j`
- `square-k` renamed to `square-letter-k`
- `square-l` renamed to `square-letter-l`
- `square-m` renamed to `square-letter-m`
- `square-n` renamed to `square-letter-n`
- `square-o` renamed to `square-letter-o`
- `square-p` renamed to `square-letter-p`
- `square-q` renamed to `square-letter-q`
- `square-r` renamed to `square-letter-r`
- `square-s` renamed to `square-letter-s`
- `square-t` renamed to `square-letter-t`
- `square-u` renamed to `square-letter-u`
- `square-w` renamed to `square-letter-w`
- `square-x` renamed to `square-letter-x`
- `square-y` renamed to `square-letter-y`
- `square-z` renamed to `square-letter-z`
- `square-0` renamed to `square-number-0`
- `square-1` renamed to `square-number-1`
- `square-2` renamed to `square-number-2`
- `square-3` renamed to `square-number-3`
- `square-4` renamed to `square-number-4`
- `square-5` renamed to `square-number-5`
- `square-6` renamed to `square-number-6`
- `square-7` renamed to `square-number-7`
- `square-8` renamed to `square-number-8`
- `square-9` renamed to `square-number-9`

src/_icons/circle-letter-v.svg

@@ -0,0 +1,6 @@
+---
+---
+<svg>
+  <circle cx="12" cy="12" r="9" />
+  <path d="M10 8l2 8l2 -8" />
+</svg>

src/_icons/hexagon-letter-v.svg

@@ -0,0 +1,6 @@
+---
+---
+<svg>
+  <path d="M19 6.873a2 2 0 0 1 1 1.747v6.536a2 2 0 0 1 -1.029 1.748l-6 3.833a2 2 0 0 1 -1.942 0l-6 -3.833a2 2 0 0 1 -1.029 -1.747v-6.537a2 2 0 0 1 1.029 -1.748l6 -3.572a2.056 2.056 0 0 1 2 0l6 3.573h-.029z" />
+  <path d="M10 8l2 8l2 -8" />
+</svg>

src/_icons/square-letter-v.svg

@@ -0,0 +1,6 @@
+---
+---
+<svg>
+  <rect x="4" y="4" width="16" height="16" rx="2" />
+  <path d="M10 8l2 8l2 -8" />
+</svg>