dep: update bitswap for improved performance

Just make sure we've removed all the blocks. We can't guarantee that the size
will revert.

Write the PID file after listening.

The new version of bitswap should improve server-side ("seeding") performance
with high-latency disks.

ipfs namespace is now being provided to prometheus

feat: web ui 2.5.8

docs: add connmgr to config.md toc

feat: web ui 2.5.7

fix(pin): wait till after fetching to remove direct pin

Otherwise, we could abort while fetching the graph and stay in a state where the
direct pin is removed.

fixes #4650

Relevant release notes can be found on [v2.5.5](https://github.com/ipfs-shipyard/ipfs-webui/releases/tag/v2.5.5).

README: improve build documentation

fixes #6704

fixes #6704

Introduce buzhash chunker      

Pinning interop: Pin ls returns appropriate zero value

fix(resolve): correctly handle .eth domains

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

It has the same properties as Rabin but is much faster.
Benchmark results:

```
name             speed
Buzhash2/1K-4    1.71GB/s ± 4%
Buzhash2/1M-4    1.15GB/s ± 2%
Buzhash2/16M-4    892MB/s ± 1%
Buzhash2/100M-4   904MB/s ± 2%
Rabin/1K-4       13.8MB/s ± 3%
Rabin/1M-4        171MB/s ± 3%
Rabin/16M-4       182MB/s ± 4%
Rabin/100M-4      182MB/s ± 3%
Default/1K-4     1.74GB/s ± 4%
Default/1M-4     3.22GB/s ± 2%
Default/16M-4    3.88GB/s ± 2%
Default/100M-4   4.21GB/s ± 6%
```

License: MIT
Signed-off-by: Jakub Sztandera <kubuxu@protocol.ai>

This should have been handled down inside the DNSLink resolver. Otherwise, we'll
break any name happens to end in `.eth`.

also fixes #6699

Update README.md

Change first link under "Getting Started" to more specific docs per https://github.com/ipfs/go-ipfs/pull/6692#issuecomment-537110811
Ref https://github.com/ipfs/go-ipfs/pull/6692

daemon: support unix domain sockets for the API/gateway

docs: guide users to the right locations for questions

docs: readme improvements