Update numcodecs-wasm docs index

Author: juntyr

docs/index.md

@@ -19,6 +19,7 @@ The following Python packages, all published independently on PyPi, use [`numcod
 - [`numcodecs_wasm_fixed_offset_scale`][numcodecs_wasm_fixed_offset_scale]: $\frac{x - o}{s}$ codec
 - [`numcodecs_wasm_fourier_network`][numcodecs_wasm_fourier_network]: fourier feature neural network codec
 - [`numcodecs_wasm_identity`][numcodecs_wasm_identity]: identity codec
+- [`numcodecs_wasm_jpeg2000`][numcodecs_wasm_jpeg2000]: JPEG 2000 codec
 - [`numcodecs_wasm_linear_quantize`][numcodecs_wasm_linear_quantize]: linear quantization codec
 - [`numcodecs_wasm_log`][numcodecs_wasm_log]: $\ln(x)$ codec
 - [`numcodecs_wasm_pco`][numcodecs_wasm_pco]: pcodec
@@ -27,6 +28,7 @@ The following Python packages, all published independently on PyPi, use [`numcod
 - [`numcodecs_wasm_round`][numcodecs_wasm_round]: rounding codec
 - [`numcodecs_wasm_swizzle_reshape`][numcodecs_wasm_swizzle_reshape]: array axis swizzle and reshape codec
 - [`numcodecs_wasm_sz3`][numcodecs_wasm_sz3]: SZ3 codec
+- [`numcodecs_wasm_tthresh`][numcodecs_wasm_tthresh]: Tthresh codec
 - [`numcodecs_wasm_uniform_noise`][numcodecs_wasm_uniform_noise]: uniform noise codec
 - [`numcodecs_wasm_zfp`][numcodecs_wasm_zfp]: ZFP codec
 - [`numcodecs_wasm_zlib`][numcodecs_wasm_zlib]: zlib codec