Use relative URLs in landing page of tendermint API

[masih]

Using //hostname makes implicit assumptions about how the endpoint is exposed. Using relative links, however, should just work regardless.

[github-actions]

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Build	Format	Lint	Breaking	Updated (UTC)
✅ passed	✅ passed	✅ passed	✅ passed	Dec 19, 2025, 6:13 PM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.71%. Comparing base (e5a56ab) to head (4d589d1).

Files with missing lines	Patch %	Lines
...tendermint/rpc/jsonrpc/server/http_json_handler.go	0.00%	4 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main    #2636   +/-   ##
=======================================
  Coverage   43.70%   43.71%           
=======================================
  Files        1899     1899           
  Lines      158894   158893    -1     
=======================================
+ Hits        69449    69453    +4     
+ Misses      83039    83034    -5     
  Partials     6406     6406           

Flag	Coverage Δ
sei-chain	45.70% <ø> (+<0.01%)	⬆️
sei-cosmos	38.03% <ø> (+<0.01%)	⬆️
sei-db	69.06% <ø> (ø)
sei-tendermint	47.50% <0.00%> (+<0.01%)	⬆️

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Files with missing lines	Coverage Δ
...tendermint/rpc/jsonrpc/server/http_json_handler.go	67.46% <0.00%> (+0.80%)	⬆️

... and 19 files with indirect coverage changes

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