enhance info endpoint and bump to `v0.1.13`

[LiranCohen]

In a previous PR some(much desired) version information was added to the /info endpoint, however in certain environments(our docker container) this blows up.

This PR prevents the endpoint from blowing up, while also providing some optionality and defaults to fall back on and bumps version to v0.1.13

Added the text below to the README.md file:

• server is read from the process.env.npm_package_name variable that npm provides. If that does not exist, it will check for a DWN_SERVER_PACKAGE_NAME environment variable set by the user, or otherwise it will default to @web5/dwn-server.
• version and sdkVersion are read from the package.json file. It will locate the file's path either from the process.env.npm_package_json variable that npm provides. If that does not exist, it will check for a DWN_SERVER_PACKAGE_JSON environment variable set by the user, or otherwise it will default to /dwn-server/package.json which is the path within the default Docker container build.

[codecov-commenter]

Codecov Report

Attention: Patch coverage is 70.83333% with 7 lines in your changes are missing coverage. Please review.

Project coverage is 94.23%. Comparing base (40e758c) to head (d78eba3).

Files	Patch %	Lines
src/http-api.ts	69.56%	7 Missing :warning:

Additional details and impacted files

```diff @@ Coverage Diff @@ ## main #117 +/- ## ========================================== - Coverage 94.45% 94.23% -0.23% ========================================== Files 25 25 Lines 2218 2237 +19 Branches 296 299 +3 ========================================== + Hits 2095 2108 +13 - Misses 123 129 +6 ```

:umbrella: View full report in Codecov by Sentry.
:loudspeaker: Have feedback on the report? Share it here.

[LiranCohen]

@thehenrytsai spent a little more time on it to make this a more thoughtful PR. Added some notes to the readme.