move 'cleanups' directory from notes to extra/

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diff --git a/notes/cleanups/double_slash_dois.md b/notes/cleanups/double_slash_dois.md
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--- a/notes/cleanups/double_slash_dois.md
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-
-Relevant github issue: https://github.com/internetarchive/fatcat/issues/48
-
-
-## Investigate
-
-At least some of these DOIs actually seem valid, like
-`10.1026//1616-1041.3.2.86`. So shouldn't be re-writing them!
-
-    zcat release_extid.tsv.gz \
-        | cut -f1,3 \
-        | rg '\t10\.\d+//' \
-        | wc -l
-    # 59,904
-
-    zcat release_extid.tsv.gz \
-        | cut -f1,3 \
-        | rg '\t10\.\d+//' \
-        | pv -l \
-        > doubleslash_dois.tsv
-
-Which prefixes have the most double slashes?
-
-    cat doubleslash_dois.tsv | cut -f2 | cut -d/ -f1 | sort | uniq -c | sort -nr | head
-      51220 10.1037
-       2187 10.1026
-       1316 10.1024
-        826 10.1027
-        823 10.14505
-        443 10.17010
-        186 10.46925
-        163 10.37473
-        122 10.18376
-        118 10.29392
-        [...]
-
-All of the 10.1037 DOIs seem to be registered with Crossref, and at least some
-have redirects to the not-with-double-slash versions. Not all doi.org lookups
-include a redirect.
-
-I think the "correct thing to do" here is to add special-case handling for the
-pubmed and crossref importers, and in any other case allow double slashes.
-
-Not clear that there are any specific cleanups to be done for now. A broader
-"verify that DOIs are actually valid" push and cleanup would make sense; if
-that happens checking for mangled double-slash DOIs would make sense.