milestone: publish alpha version (#637)

- document folder
- full-text search
- blob storage
- basic edgeless support

Co-authored-by: tzhangchi <terry.zhangchi@outlook.com>
Co-authored-by: QiShaoXuan <qishaoxuan777@gmail.com>
Co-authored-by: DiamondThree <diamond.shx@gmail.com>
Co-authored-by: MingLiang Wang <mingliangwang0o0@gmail.com>
Co-authored-by: JimmFly <yangjinfei001@gmail.com>
Co-authored-by: Yifeng Wang <doodlewind@toeverything.info>
Co-authored-by: Himself65 <himself65@outlook.com>
Co-authored-by: lawvs <18554747+lawvs@users.noreply.github.com>
Co-authored-by: Qi <474021214@qq.com>

.gitattributes

@@ -0,0 +1,20 @@
+* text=auto eol=lf
+
+# These files are binary and should be left untouched
+*.png binary
+*.jpg binary
+*.jpeg binary
+*.gif binary
+*.ico binary
+*.mov binary
+*.mp4 binary
+*.mp3 binary
+*.ttf binary
+*.otf binary
+*.eot binary
+*.woff binary
+*.woff2 binary
+*.pdf binary
+*.tar.gz binary
+*.zip binary
+*.7z binary