修复公示解析问题

frontend/package.json

@@ -15,7 +15,7 @@
     "github-markdown-css": "^3.0.1",
     "highlight": "^0.2.4",
     "highlight.js": "^9.15.6",
-    "katex": "^0.10.1",
+    "katex": "^0.6.0",
     "markdown-it": "^8.4.2",
     "markdown-it-attrs": "^2.3.2",
     "markdown-it-katex": "^2.0.3",

frontend/yarn.lock

@@ -5634,12 +5634,6 @@ jsprim@^1.2.2:
     json-schema "0.2.3"
     verror "1.10.0"
 
-katex@^0.10.1:
-  version "0.10.1"
-  resolved "https://registry.npmjs.org/katex/-/katex-0.10.1.tgz#5bb0b72bf19cecfc1fa217a9261760e5d301efff"
-  dependencies:
-    commander "^2.19.0"
-
 katex@^0.6.0:
   version "0.6.0"
   resolved "https://registry.npmjs.org/katex/-/katex-0.6.0.tgz#12418e09121c05c92041b6b3b9fb6bab213cb6f3"

help/FEATURES.md

@@ -78,6 +78,12 @@ $$\begin{array}{c}
 \nabla \cdot \vec{\mathbf{B}} & = 0
 \end{array}$$
 
+equation | description
+----------|------------
+$\nabla \cdot \vec{\mathbf{B}}  = 0$ | divergence of $\vec{\mathbf{B}}$ is zero
+$\nabla \times \vec{\mathbf{E}}\, +\, \frac1c\, \frac{\partial\vec{\mathbf{B}}}{\partial t}  = \vec{\mathbf{0}}$ |  curl of $\vec{\mathbf{E}}$ is proportional to the rate of change of $\vec{\mathbf{B}}$
+$\nabla \times \vec{\mathbf{B}} -\, \frac1c\, \frac{\partial\vec{\mathbf{E}}}{\partial t} = \frac{4\pi}{c}\vec{\mathbf{j}}    \nabla \cdot \vec{\mathbf{E}} = 4 \pi \rho$ | _wha?_
+
 ## 运行代码
 支持运行 `PHP` `nodejs` `Python` `bash` `bat` 代码。
 此功能执行外部命令实现，所以需要安装相应环境。