chore(docs): bump to 0.1.8 and update CI badge

[skyzh]

Signed-off-by: Alex Chi [email protected]

What's changed and what's your intention?

As title

Checklist

• I have written necessary docs and comments
• I have added necessary unit tests and integration tests
• All checks passed in ./risedev check (or alias, ./risedev c)

Refer to a related PR or issue link (optional)

[codecov]

Codecov Report

Merging #3056 (0545d63) into main (43e0f29) will increase coverage by 0.00%.
The diff coverage is n/a.

@@           Coverage Diff           @@
##             main    #3056   +/-   ##
=======================================
  Coverage   73.50%   73.50%           
=======================================
  Files         732      732           
  Lines       99398    99398           
=======================================
+ Hits        73065    73066    +1     
+ Misses      26333    26332    -1     

Flag	Coverage Δ
rust	73.50% <ø> (+<0.01%)	⬆️

Flags with carried forward coverage won't be shown. Click here to find out more.

Impacted Files	Coverage Δ
src/meta/src/model/barrier.rs	78.57% <0.00%> (-3.58%)	⬇️
src/storage/src/hummock/compactor.rs	70.03% <0.00%> (+0.17%)	⬆️
src/meta/src/barrier/mod.rs	69.45% <0.00%> (+0.32%)	⬆️

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