Update docs URLs to new paths

[tbantle22]

Migrate all docs.dolthub.com, docs.doltgres.com references to the new dolthub.com/docs, doltgres.com/docs URLs in the READMEs.

[github-actions]

	Main	PR
covering_index_scan_postgres	1315.99/s	1309.83/s	-0.5%
index_join_postgres	186.61/s	187.58/s	+0.5%
index_join_scan_postgres	193.99/s	195.77/s	+0.9%
index_scan_postgres	12.21/s	12.31/s	+0.8%
oltp_point_select	2392.31/s	2390.75/s	-0.1%
oltp_read_only	1771.99/s	1792.63/s	+1.1%
select_random_points	127.89/s	128.86/s	+0.7%
select_random_ranges	870.33/s	869.59/s	-0.1%
table_scan_postgres	12.07/s	11.92/s	-1.3%
types_table_scan_postgres	5.54/s	5.55/s	+0.1%

[github-actions]

	Main	PR
Total	42090	42090
Successful	18126	18126
Failures	23964	23964
Partial Successes1	5384	5384

	Main	PR
Successful	43.0649%	43.0649%
Failures	56.9351%	56.9351%

Footnotes

1. These are tests that we're marking as Successful, however they do not match the expected output in some way. This is due to small differences, such as different wording on the error messages, or the column names being incorrect while the data itself is correct. ↩