graphs: replace collectd with our custom collector

collectd (with the python plugin) seems semi-abandoned. replace
with our own. we have more control over how to collect things instead
of relying on random plugins.

src/infra_version.js

@@ -12,7 +12,7 @@ exports = module.exports = {
     // docker inspect --format='{{index .RepoDigests 0}}' $IMAGE to get the sha256 . note this has registry in it because manifest id is registry specific!
     'images': {
         // 'base': 'registry.docker.com/cloudron/base:5.0.0@sha256:04fd70dbd8ad6149c19de39e35718e024417c3e01dc9c6637eaf4a41ec4e596c',
-        'graphite': 'registry.docker.com/cloudron/graphite:3.5.0@sha256:ee7c9dc49a6507cb3e3cee25495b2044908feb91dac5df87a9633dea38fdeb8a',
+        'graphite': 'registry.docker.com/cloudron/graphite:3.5.1@sha256:5383f694245f25a386140268b490a41aa0ba6fb0024d92852546e40c8458681f',
         'mail': 'registry.docker.com/cloudron/mail:3.16.4@sha256:468239e1f7a9dc2cdf66750e66b83f1c561048fdd88ce7110fac89a5f7fb8777',
         'mongodb': 'registry.docker.com/cloudron/mongodb:6.1.1@sha256:dd5db2d17c1232e1f8ef5528c86c20b70ba654b199d94de44d22afb17aac00aa',
         'mysql': 'registry.docker.com/cloudron/mysql:3.5.2@sha256:5cf52069a5ffb126afcaf6cdf91dba7e2c719efe48669e46b616979ef825e25b',