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	Jan 16, 2026, 10:42 AM

[codecov]

Codecov Report

❌ Patch coverage is 0% with 4 lines in your changes missing coverage. Please review.
✅ Project coverage is 43.76%. Comparing base (ef2912e) to head (51b0e72).
⚠️ Report is 1 commits behind head on main.

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   43.75%   43.76%           
=======================================
  Files        1913     1913           
  Lines      159492   159491    -1     
=======================================
+ Hits        69791    69801   +10     
+ Misses      83279    83269   -10     
+ Partials     6422     6421    -1     

Flag	Coverage Δ
sei-chain	45.76% <ø> (+<0.01%)	⬆️
sei-cosmos	38.20% <ø> (-0.01%)	⬇️
sei-db	68.72% <ø> (ø)
sei-tendermint	47.31% <0.00%> (+0.02%)	⬆️

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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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