Markdown formatting, typos.

Makes the repository handle file line endings.
This helps to make it cross-platform, asserting some files are Unix-ended.

Uses the prefeed name of the Compose specification.

Changes:
- Removes the deprecated "version" field,
- Adds a toplevel "name" field (prefix of container names nad network),
- Adds a toplevel "network" field, with a common "timesketch-dev"
  network,
- Removes container names (depends on and toplevel name and service
  names),
- Do not bind to the 127.0.0.1 interface only (0.0.0.0),
- Removes useless "links" (common network),
- Refactors environment variables to don't use a YAML array,
- Removes "restart" fields to detect undesired crashes in development,
- Binds ports of other services to the host (opensearch, redis).

Adds .gitignore files.
Dramatically improves an image build in a development context.

Adapts the list to the latest version of the repository:
- Fixes moved ones,
- Deletes removed ones.

Changes are:
- Allows Docker image builds in a restricted company context (limited
  access to remote Ubuntu, Python or Node repositories) using variables,
- Centralizes variables in a .env file (not versioned),
- Adds a .env.template file as .env template with predefined variables,
- Use a distinct directory for every service dependencies,
- Use a per-service environment file,
- Simplifies how development configuration files are transferred to
  Timesketch,
- Simplifies manipulation of containers using Compose CLI instead of
  the Docker one,
- Simplify and optimizes the Timesketch entrypoint,
- Updates the Bash scripts to start frontend-ng,
- Updates related documentation.