Fix link check (#4074)
Closes #4041
Changes:
- Increase cache size and reduce retries.
- Ignore Substrate SE links :(
- Fix broken link.
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Signed-off-by: 
Oliver Tale-Yazdi <[email protected]>
Closes #4041
Changes:
- Increase cache size and reduce retries.
- Ignore Substrate SE links :(
- Fix broken link.
---------
Signed-off-by: Oliver Tale-Yazdi <[email protected]>