Bump markdownlint-cli2 from 0.4.0 to 0.5.0 and fix reveald issues

[yubiuser]

What does this PR aim to accomplish?:

Fixes issues which were revealed by https://github.com/pi-hole/docs/pull/748

And bump markdownlint-cli2 from 0.4.0 to 0.5.0 as https://github.com/pi-hole/docs/pull/748 does.

• How does this PR accomplish the above?:

Fix link labels, removed broken links....

P.S. It looks like the TOR guide was never really finished

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[yubiuser]

The following errors could not be mitigated (but the links work on the web page!) and have been suppressed with <!-- markdownlint-disable-line MD051 -->

docs/core/pihole-command.md:33:1 MD051/link-fragments Link fragments should be valid [Context: "[Enable & Disable](#enable-&-disable)"]
docs/ftldns/configfile.md:57:64 MD051/link-fragments Link fragments should be valid [Context: "[`LOCAL_IPV4`](#local_ipv4)"]
docs/ftldns/configfile.md:68:66 MD051/link-fragments Link fragments should be valid [Context: "[`BLOCK_IPV4`](#block_ipv4)"]
docs/ftldns/configfile.md:223:66 MD051/link-fragments Link fragments should be valid [Context: "[here](../database/index.md)). Furthermore, FTL stores log files (see, e.g., [here](#file_LOGFILE)"]