Fix for default file paths

[marcelldls]

Currently the default epics options set an absolute file path. For example:

@dataclass
class EpicsDocsOptions:
    path: Path = Path.cwd()  # The subject of this PR
    depth: int | None = None

This means that the resulting schema depends on the host and execution context:

    "EpicsDocsOptions": {
      "properties": {
        "path": {
          "default": "/workspaces/thorlabs-mff-fastcs",  # Changes dynamically
          "format": "path",
          "title": "Path",
          "type": "string"
        },
        "depth": {
          "anyOf": [
            {
              "type": "integer"
            },
            {
              "type": "null"
            }
          ],
          "default": null,
          "title": "Depth"
        }
      },

Here it is proposed to rather use a relative path. This does not prevent an absolute path being passed. It allows the same functionality as before but with a consistent schema and additionally allows to make alterations to the relative path. This results in a schema of:

    "EpicsDocsOptions": {
      "properties": {
        "path": {
          "default": ".",
          "format": "path",
          "title": "Path",
          "type": "string"
        },
        "depth": {
          "anyOf": [
            {
              "type": "integer"
            },
            {
              "type": "null"
            }
          ],
          "default": null,
          "title": "Depth"
        }
      },

[codecov]

Codecov Report

Attention: Patch coverage is 66.66667% with 1 line in your changes missing coverage. Please review.

Project coverage is 88.08%. Comparing base (e4d710b) to head (4c234fd).
Report is 2 commits behind head on main.

Files with missing lines	Patch %	Lines
src/fastcs/transport/epics/gui.py	0.00%	1 Missing ⚠️

Additional details and impacted files

@@           Coverage Diff           @@
##             main     #110   +/-   ##
=======================================
  Coverage   88.08%   88.08%           
=======================================
  Files          31       31           
  Lines        1309     1309           
=======================================
  Hits         1153     1153           
  Misses        156      156           

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[marcelldls]

@GDYendell Rebased to solved failed linting