Fix typos in configuration.md

[Ricket]

I noticed the OpenID-Conenct typo while reading the docs, so I came here to fix that typo and ended up finding several more. The mistakes were found by AI but fixed by hand. Expanding "sitename" to "site name" is perhaps the only controversial one, feel free to undo that one if you prefer.

[marcelfolaron]

Thank you!

[marcelfolaron]

Maintainer review (advisory — merge authority stays with @marcelfolaron / @broskees)

Intent: Batch typo/grammar cleanup across installation/configuration.md (OIDC heading, LDAP section, telemetry section, "Sitename"→"Site name", plus many small spelling fixes).

Change requests (must address before merge):

1. New typo introduced — blocker. installation/configuration.md:25 changes (can be emtpy) → (can be empyy). The target word is empty. Please correct:

   -LEAN_S3_FOLDER_NAME=''          # Foldername within S3 (can be empyy)
   +LEAN_S3_FOLDER_NAME=''          # Foldername within S3 (can be empty)

2. Overlap with Typo in configuration.md #46. The OpenID-Conenct → OpenID-Connect heading fix (configuration.md:~176) is also the entire content of Typo in configuration.md #46. This PR supersedes Typo in configuration.md #46 — recommend merging this one and closing Typo in configuration.md #46 to avoid a conflict.
3. Optional / judgment call: the Sitename → Site name expansion (configuration.md:166 heading and body) is a wording change, not a typo. The author flagged it as debatable; fine to keep, but confirm it doesn't break any in-page anchor links that reference #sitename.

Acceptance checklist (must pass before merge):

1. CLA signed / green.
2. The empyy→empty fix (item 1) is applied — do not merge with the introduced typo.
3. Typo in configuration.md #46 closed as superseded (dedupe), and any #sitename anchor references updated if the heading text changed.

CI status: No unit-test gate for docs. Primary gates are CLA + the manual correctness check above. The introduced empyy typo is the one hard blocker here.

[marcelfolaron]

Maintainer review — status: needs-info (advisory) · priority: P3 · next action: author fixes one introduced typo · owner: @Ricket

1. Intent: Fixes a batch of spelling/capitalization typos across installation/configuration.md (environment, process, across, method, separated, necessary, "OpenID-Conenct" → "OpenID-Connect", consistent "Leantime" casing, "Sitename" → "Site name").

2. Change requests:

• Blocker (introduced typo): the S3 folder-name line replaces one typo with another. At installation/configuration.md:25:

  -LEAN_S3_FOLDER_NAME=''          # Foldername within S3 (can be emtpy)
  +LEAN_S3_FOLDER_NAME=''          # Foldername within S3 (can be empyy)

  emtpy → empyy is still wrong; it should be empty. Please correct this before merge.
• Optional (scope): the "Sitename" → "Site name" heading change at configuration.md:166 alters an anchor (#sitename → #site-name). Low risk since the docs don't appear to deep-link it, but worth a grep for #sitename before merging.
• Overlap: this PR fully supersedes Typo in configuration.md #46 (same OIDC typo, single line). If you merge Fix typos in configuration.md #45, close Typo in configuration.md #46 as included.

3. Acceptance checklist (must pass before merge):

• empyy → empty corrected (see above)
• Docs build/link-check CI green
• Confirm no external links rely on the old #sitename anchor

4. CI status: Check-run status isn't readable through my current tooling — please confirm green in the UI. Docs-only, no behavior change, so no test is required; the one blocker above is a content correctness issue, not a test gap.

Advisory review only — not an approval. Merge authority stays with @marcelfolaron / @broskees.