docs: make update command and clarify update steps/potential danger

Jacky Zhao

2022-04-05 a7abc6ab96002d103e5e349f345d4108550256f5

 .gitignore

@@ -3,5 +3,5 @@
resources
.idea
content/.obsidian
static/linkIndex.json
static/contentIndex.json
assets/indices/linkIndex.json
assets/indices/contentIndex.json